Merge pull request 'feat(shell): give every Dashboard page a real URL, with modules at /<module-id> (Stage 1, ADR 0057)' (#103) from feat/dashboard-url-routing into main

Reviewed-on: #103
Reviewed-by: Joey <[email protected]>

README.md

@@ -822,7 +822,8 @@ hosting are deployment work, not guarantees added by this pass. Display device i
 public Website remain separate future designs.
 
 **Still not the finished Dashboard.** There is no navigation editor or drag and drop, no nested
-folders, no icons or colors, no Dashboard Home or widgets, no design system, no client-side routing,
+folders, no icons or colors, no Dashboard Home or widgets, no design system, no client-side routing
+(since added; see the Stage 1 paragraph below),
 and no module-management, settings, or storage UI — module enablement and configuration are an API and
 a CLI, not a screen, and object storage is deployment configuration. A production CSP and
 deployment for the built shells, general sidecar asset publication, React runtime sharing, the
@@ -905,6 +906,19 @@ the module's responsibility and do not exist yet.**
 Ekklesia Lite, a theme editor, a module store or installer, a standalone host, and every feature
 module — Signage included — still do not exist, and nothing in Phase 8 claims otherwise.
 
+Stage 1 begins with **real Dashboard URLs**
+([ADR 0057](docs/architecture/decisions/0057-dashboard-urls-are-host-owned-routes.md)). The
+Dashboard opens on an **Overview** at `/`, and each module is a top-level destination with its own
+address, `/<module-id>` (`/signage`), beside `/settings` and `/account`, so a refresh, a bookmark,
+and a shared link land on the page that was open and Back and Forward walk the Dashboard's own pages.
+The API serves the same Dashboard page at `/`, throughout `/settings` and `/account`, and throughout
+each installed module's `/<module-id>`; any other top-level path is its sanitized `404`. Core reserves
+the platform's own top-level names (`account`, `api`, `assets`, `display`, `settings`), and
+discovery refuses a module that uses one. An installed module that is disabled shows a host-owned
+*This page isn't available* rather than loading anything. A module's own
+sub-pages, Settings and Account pages, the sidebar redesign, and returning to the workflow a Settings
+link came from are later Stage 1 work.
+
 ## Quick start
 
 Prerequisites: Node.js 24 LTS, pnpm 11.12, and Docker with Compose.

apps/api/src/app.ts

@@ -363,10 +363,18 @@ export function createApiApp(options: CreateApiAppOptions): Hono {
   // own entirely. See `./health-routes.js`.
   app.route("/", createHealthRoutes(options.health));
 
-  // The Dashboard page and its one script, at exact literal paths outside `/api/` (ADR 0044). They
-  // grant no authority and resolve no principal; the page asks `/api/v1/principal` itself. See
-  // `./dashboard-host-routes.js`.
-  app.route("/", createDashboardHostRoutes(options.dashboardHostAssets));
+  // The Dashboard page and its one script, at fixed paths outside `/api/` (ADR 0044, ADR 0057): the
+  // page at `/`, the Dashboard's platform pages, and every discovered module with a Dashboard UI at
+  // `/<module-id>`. They grant no authority and resolve no principal; the page asks
+  // `/api/v1/principal` itself. See `./dashboard-host-routes.js`.
+  app.route(
+    "/",
+    createDashboardHostRoutes(options.dashboardHostAssets, {
+      modulePages: options.moduleLifecycle.snapshot.discoveredModules
+        .filter((module) => module.entrypoints.ui !== undefined)
+        .map((module) => module.manifest.id),
+    }),
+  );
 
   app.route(
     "/",

apps/api/src/dashboard-host-routes.ts

@@ -1,13 +1,19 @@
+import { moduleIdSchema } from "@ekklesia/contracts";
+import { isReservedModuleId } from "@ekklesia/core/modules";
+import { DASHBOARD_PLATFORM_PAGES } from "@ekklesia/shell/dashboard-routes";
 import { Hono } from "hono";
 import { etagMatches } from "./conditional-request.js";
 import { createDashboardHostAssets, type DashboardHostAssets } from "./dashboard-host-assets.js";
 
 /**
- * The Dashboard's two host-owned routes (ADR 0044). Neither can collide with anything else the API
- * serves: `/` is the only page the Dashboard has — it has no client router, and every emailed
- * verification or reset link lands on `/` with a query (ADR 0038) — and the script lives beside, never
- * inside, the display host's `/assets/ekklesia-display/` namespace. Module routes all live under
- * `/api/v1/modules/<module-id>`.
+ * The Dashboard's host-owned routes (ADR 0044, ADR 0057). None can collide with anything else the API
+ * serves: the page answers at `/`, at the Dashboard's own platform pages (which the shell exports, so
+ * this server and the shell's router read one list), and at each installed module's `/<module-id>`.
+ * Every one of those first segments is either a reserved platform name or a module id Core accepted,
+ * and Core refuses a module id that is a reserved name, so no module page can shadow `/api`,
+ * `/assets`, `/display`, or a platform page. The script lives beside, never inside, the display
+ * host's `/assets/ekklesia-display/` namespace, and every emailed verification or reset link still
+ * lands on `/` with a query (ADR 0038).
  */
 export const DASHBOARD_HOST_PAGE_PATH = "/";
 export const DASHBOARD_HOST_SCRIPT_PATH = "/assets/ekklesia-dashboard/app.js";
@@ -85,29 +91,73 @@ function fixedAsset(
   });
 }
 
+export interface DashboardHostRouteOptions {
+  /**
+   * The id of every module this process discovered that declares a Dashboard UI — enabled or not,
+   * since a disabled module's bookmark should open the Dashboard and say the module is unavailable
+   * rather than fail as an unknown address. Fixed at startup, like the rest of the module set.
+   */
+  readonly modulePages: readonly string[];
+}
+
+/** Each module page must be a real module id that names no platform namespace, exactly once.
+ * Discovery already guarantees this; the routes refuse to compose rather than trust it. */
+function validatedModulePages(modulePages: readonly string[]): readonly string[] {
+  const seen = new Set<string>();
+  for (const moduleId of modulePages) {
+    if (
+      !moduleIdSchema.safeParse(moduleId).success ||
+      isReservedModuleId(moduleId) ||
+      DASHBOARD_PLATFORM_PAGES.some((page) => page === moduleId) ||
+      seen.has(moduleId)
+    ) {
+      throw new DashboardHostConfigurationError();
+    }
+    seen.add(moduleId);
+  }
+  return [...seen];
+}
+
 /**
  * Serves the built Dashboard from the same origin as `/api`, so the identity system keeps its
  * default same-origin shape.
  *
- * Two exact literal routes over one frozen snapshot: never a static directory, never a path or file
- * name taken from the request, and never the source map. Any other path — `/index.html`, `/app.js`,
- * the `.map`, a traversal spelling — has no route and falls through to the application's ordinary
- * sanitized `404`. Like the display host's code, these bytes grant no authority: the page renders
- * the sign-in form until `/api/v1/principal` says otherwise.
+ * Fixed routes over one frozen snapshot: never a static directory, never a path or file name taken
+ * from the request, and never the source map. The page answers at `/`, anywhere inside a Dashboard
+ * platform page (`/settings/displays/add` as much as `/settings`), and anywhere inside an installed
+ * module's page (`/signage/timelines` as much as `/signage`, so the module's own sub-pages need no
+ * server change later) — always with the **same** bytes and the same validator, because the path
+ * selects a page inside the shell rather than a file here; that is what lets a refreshed or
+ * bookmarked deep link stay where it was.
+ *
+ * A top-level name that is neither — `/definitely-not-a-real-module`, a module that is not
+ * installed or has no Dashboard UI, a look-alike such as `/settings-old` — has no route, nor does
+ * `/index.html`, `/app.js`, the `.map`, or a traversal spelling: all fall through to the
+ * application's ordinary sanitized `404`. Like the display host's code, these bytes grant no
+ * authority: the page renders the sign-in form until `/api/v1/principal` says otherwise.
  */
-export function createDashboardHostRoutes(assets: DashboardHostAssets): Hono {
+export function createDashboardHostRoutes(
+  assets: DashboardHostAssets,
+  options: DashboardHostRouteOptions,
+): Hono {
   const snapshot = snapshotAssets(assets);
+  const modulePages = validatedModulePages(options.modulePages);
   const routes = new Hono();
 
-  routes.get(DASHBOARD_HOST_PAGE_PATH, (c) =>
+  const page = (ifNoneMatch: string | undefined): Response =>
     fixedAsset(
-      c.req.header("if-none-match"),
+      ifNoneMatch,
       snapshot.html,
       snapshot.htmlEtag,
       "text/html; charset=utf-8",
       DASHBOARD_PAGE_SECURITY_HEADERS,
-    ),
-  );
+    );
+
+  routes.get(DASHBOARD_HOST_PAGE_PATH, (c) => page(c.req.header("if-none-match")));
+  for (const name of [...DASHBOARD_PLATFORM_PAGES, ...modulePages]) {
+    routes.get(`/${name}`, (c) => page(c.req.header("if-none-match")));
+    routes.get(`/${name}/*`, (c) => page(c.req.header("if-none-match")));
+  }
 
   routes.get(DASHBOARD_HOST_SCRIPT_PATH, (c) =>
     fixedAsset(

apps/api/tests/dashboard-host-routes.test.ts

@@ -2,6 +2,7 @@ import { createHash } from "node:crypto";
 import {
   ANONYMOUS_PRINCIPAL,
   type ModuleRouteHandler,
+  parseModuleManifest,
   parsePermissionId,
   type RegisteredModuleHttpRoute,
 } from "@ekklesia/contracts";
@@ -13,9 +14,13 @@ import {
 import type { EkklesiaIdentityRuntime } from "@ekklesia/core/identity";
 import {
   createModuleUiPublicationRegistry,
+  type DiscoveredModule,
   EMPTY_MODULE_REALTIME_REGISTRY,
+  isReservedModuleId,
   type LegacyModuleRuntimeServices,
   type ModuleDatabase,
+  type ModuleLifecycleConfiguration,
+  RESERVED_MODULE_IDS,
 } from "@ekklesia/core/modules";
 import { describe, expect, it, vi } from "vitest";
 
@@ -33,11 +38,23 @@ import {
   DASHBOARD_HOST_PAGE_PATH,
   DASHBOARD_HOST_SCRIPT_PATH,
   DashboardHostConfigurationError,
+  createDashboardHostRoutes,
 } from "../src/dashboard-host-routes.js";
-import { DISPLAY_HOST_SCRIPT_PATH } from "../src/module-display-routes.js";
+import { DASHBOARD_PLATFORM_PAGES } from "@ekklesia/shell/dashboard-routes";
+import {
+  MODULE_DISPLAY_DESCRIPTOR_PREFIX,
+  MODULE_DISPLAY_PAGE_PREFIX,
+} from "../src/module-display-path.js";
+import {
+  DISPLAY_HOST_SCRIPT_PATH,
+  DISPLAY_SERVICE_WORKER_PATH,
+} from "../src/module-display-routes.js";
 import { createInMemoryDashboardStore } from "./support/in-memory-dashboard-store.js";
 import { emptyModuleConfiguration } from "./support/in-memory-module-configuration.js";
-import { emptyModuleLifecycle } from "./support/in-memory-module-lifecycle.js";
+import {
+  createInMemoryModuleLifecycleStore,
+  moduleLifecycleSnapshotFor,
+} from "./support/in-memory-module-lifecycle.js";
 import { emptyModuleStorage } from "./support/in-memory-module-storage.js";
 import { readyHealth } from "./support/ready-health.js";
 
@@ -78,9 +95,40 @@ function fakeModuleServices(): LegacyModuleRuntimeServices {
   return Object.freeze({ database: Object.freeze({}) as unknown as ModuleDatabase });
 }
 
+/** A discovered module as the boot snapshot records it, from a real validated manifest. Only its id
+ * and whether it declares a Dashboard UI matter to these routes; nothing is ever loaded. */
+function discoveredModule(id: string, options: { readonly ui: boolean }): DiscoveredModule {
+  const manifest = parseModuleManifest({
+    capabilities: [],
+    compatibility: { moduleSdk: "^0.2.0", platform: "^0.2.0" },
+    entrypoints: {
+      server: "./dist/server/index.js",
+      ...(options.ui ? { ui: "./dist/ui/index.js" } : {}),
+    },
+    id,
+    manifestVersion: 8,
+    name: `${id} module`,
+    permissions: [],
+    version: "0.1.0",
+  });
+  return {
+    contributions: [],
+    directory: `/modules/${id}`,
+    entrypoints: {
+      server: `/modules/${id}/dist/server/index.js`,
+      ...(options.ui ? { ui: `/modules/${id}/dist/ui/index.js` } : {}),
+    },
+    manifest,
+    manifestPath: `/modules/${id}/ekklesia.module.json`,
+    packageName: `@test/${id}`,
+  };
+}
+
 function buildApp(
   options: {
     readonly assets?: DashboardHostAssets;
+    readonly configuration?: ModuleLifecycleConfiguration;
+    readonly discovered?: readonly DiscoveredModule[];
     readonly moduleRoutes?: readonly RegisteredModuleHttpRoute[];
   } = {},
 ) {
@@ -100,7 +148,10 @@ function buildApp(
     moduleRealtime: EMPTY_MODULE_REALTIME_REGISTRY,
     moduleServices: fakeModuleServices(),
     moduleUi: createModuleUiPublicationRegistry([]),
-    moduleLifecycle: emptyModuleLifecycle(),
+    moduleLifecycle: {
+      snapshot: moduleLifecycleSnapshotFor(options.discovered ?? [], options.configuration),
+      store: createInMemoryModuleLifecycleStore(),
+    },
     moduleConfiguration: emptyModuleConfiguration(),
     moduleStorage: emptyModuleStorage(),
     dashboard: createInMemoryDashboardStore(),
@@ -193,6 +244,169 @@ describe("GET / (the Dashboard page)", () => {
   });
 });
 
+describe("Dashboard deep links (ADR 0057)", () => {
+  const installed = () => [
+    discoveredModule("signage", { ui: true }),
+    discoveredModule("calendar", { ui: true }),
+    discoveredModule("retired", { ui: true }),
+    // A display-only module has no Dashboard page (ADR 0033).
+    discoveredModule("lobby-screen", { ui: false }),
+  ];
+  // Installed but disabled: its address still opens the Dashboard, which says it is unavailable.
+  const configuration = { modules: [{ enabled: false, moduleId: "retired" }] };
+
+  const deepLinks = [
+    "/settings",
+    "/settings/",
+    "/settings/displays/add",
+    "/account",
+    "/account/appearance",
+    "/signage",
+    "/signage/",
+    // Reserved for the module's own pages, which the shell will interpret (ADR 0057).
+    "/signage/timelines",
+    "/signage/timelines/a1b2",
+    "/calendar",
+    "/retired",
+  ];
+
+  it("serves the shell's own platform pages, from the shell's own list", () => {
+    expect(DASHBOARD_PLATFORM_PAGES).toEqual(["settings", "account"]);
+  });
+
+  it("serves the identical page, validator, and security headers at every Dashboard page, so a refresh stays put", async () => {
+    const { app } = buildApp({ configuration, discovered: installed() });
+
+    for (const path of deepLinks) {
+      const response = await app.request(path);
+      expect(response.status, path).toBe(200);
+      expect(await response.text(), path).toBe(PAGE_HTML);
+      expect(response.headers.get("content-type"), path).toBe("text/html; charset=utf-8");
+      expect(response.headers.get("cache-control"), path).toBe("no-cache");
+      expect(response.headers.get("etag"), path).toBe(PAGE_ETAG);
+      expectPageSecurityHeaders(response);
+    }
+    expect(readFileMock).not.toHaveBeenCalled();
+  });
+
+  it("revalidates a deep link with the page's one validator", async () => {
+    const { app } = buildApp({ discovered: installed() });
+
+    for (const path of ["/settings/displays", "/signage"]) {
+      const response = await app.request(path, { headers: { "If-None-Match": PAGE_ETAG } });
+      expect(response.status, path).toBe(304);
+      expect(await response.text(), path).toBe("");
+      expectPageSecurityHeaders(response);
+    }
+  });
+
+  it("never turns an arbitrary top-level path into a Dashboard page", async () => {
+    const { app } = buildApp({ configuration, discovered: installed() });
+
+    for (const path of [
+      "/definitely-not-a-real-module",
+      "/definitely-not-a-real-module/timelines",
+      // Installed, but with no Dashboard UI.
+      "/lobby-screen",
+      // Look-alikes of real pages.
+      "/signages",
+      "/signage-old",
+      "/Signage",
+      "/settings-old",
+      "/accounts",
+      // The former implementation prefix is not a namespace at all.
+      "/modules",
+      "/modules/signage",
+    ]) {
+      await expectSanitizedNotFound(await app.request(path), path);
+    }
+  });
+
+  it("serves a module's page only while that module is installed", async () => {
+    const { app } = buildApp({ discovered: [] });
+
+    await expectSanitizedNotFound(await app.request("/signage"), "/signage");
+    expect((await app.request("/settings")).status).toBe(200);
+  });
+
+  it("serves the page and never the script, whatever a deep link's last segment looks like", async () => {
+    const { app } = buildApp({ discovered: installed() });
+
+    for (const path of [
+      "/signage/app.js",
+      "/settings/assets/ekklesia-dashboard/app.js",
+      "/account/index.html",
+    ]) {
+      expect(await (await app.request(path)).text(), path).toBe(PAGE_HTML);
+    }
+  });
+
+  it("answers no other method at a Dashboard page", async () => {
+    const { app } = buildApp({ discovered: installed() });
+
+    for (const path of ["/settings/displays", "/signage"]) {
+      for (const method of ["POST", "PUT", "PATCH", "DELETE"]) {
+        await expectSanitizedNotFound(await app.request(path, { method }), `${method} ${path}`);
+      }
+    }
+  });
+
+  it("refuses at composition a module page that would shadow a platform namespace", () => {
+    for (const modulePages of [["api"], ["settings"], ["display"], ["Not-An-Id"], ["a", "a"]]) {
+      expect(
+        () =>
+          createDashboardHostRoutes(createDashboardHostAssets(PAGE_HTML, SCRIPT), { modulePages }),
+        JSON.stringify(modulePages),
+      ).toThrow(DashboardHostConfigurationError);
+    }
+  });
+});
+
+describe("the platform's reserved top-level names (ADR 0057)", () => {
+  it("cover every top-level namespace the API registers, so a module page can never shadow one", () => {
+    const { app } = buildApp({ discovered: [discoveredModule("signage", { ui: true })] });
+
+    const topLevel = new Set(
+      app.routes
+        .map((route) => route.path.split("/")[1] ?? "")
+        .filter((segment) => segment !== "" && segment !== "*"),
+    );
+    topLevel.delete("signage");
+
+    // This composition publishes no display, so the display host's routes are absent here; they
+    // are checked through their own path constants below.
+    expect([...topLevel].sort()).toEqual(["account", "api", "assets", "settings"]);
+    for (const segment of topLevel) {
+      expect(isReservedModuleId(segment), segment).toBe(true);
+    }
+  });
+
+  it("cover the display host's pages, service worker, and script, and the Dashboard's script", () => {
+    for (const path of [
+      MODULE_DISPLAY_PAGE_PREFIX,
+      DISPLAY_SERVICE_WORKER_PATH,
+      DISPLAY_HOST_SCRIPT_PATH,
+      DASHBOARD_HOST_SCRIPT_PATH,
+      MODULE_DISPLAY_DESCRIPTOR_PREFIX,
+    ]) {
+      expect(isReservedModuleId(path.split("/")[1] ?? ""), path).toBe(true);
+    }
+    expect([...RESERVED_MODULE_IDS].sort()).toEqual([
+      "account",
+      "api",
+      "assets",
+      "display",
+      "settings",
+    ]);
+  });
+
+  it("include every Dashboard platform page the shell interprets", () => {
+    for (const page of DASHBOARD_PLATFORM_PAGES) {
+      expect(RESERVED_MODULE_IDS, page).toContain(page);
+    }
+  });
+});
+
 describe("GET /assets/ekklesia-dashboard/app.js (the Dashboard script)", () => {
   it("serves the exact startup script bytes as JavaScript with revalidation and a strong ETag", async () => {
     const { app } = buildApp();

core/src/modules/discovery.ts

@@ -9,6 +9,7 @@ import {
   safeParseModuleManifest,
   semanticVersionSchema,
 } from "@ekklesia/contracts";
+import { isReservedModuleId } from "./reserved-ids.js";
 
 export const MODULE_MANIFEST_FILENAME = "ekklesia.module.json";
 
@@ -39,6 +40,7 @@ export type ModuleDiscoveryIssueCode =
   | "MODULE_ENTRYPOINT_INVALID"
   | "MODULE_ENTRYPOINT_MISSING"
   | "MODULE_ID_DUPLICATE"
+  | "MODULE_ID_RESERVED"
   | "MODULE_MANIFEST_INVALID"
   | "MODULE_MANIFEST_MISSING"
   | "MODULE_PACKAGE_INVALID"
@@ -614,6 +616,18 @@ async function scanModuleDirectory(
     });
   }
 
+  if (isReservedModuleId(manifest.id)) {
+    // A module's Dashboard page is `/<module-id>` (ADR 0057), in the same URL space as the
+    // platform's own top-level namespaces.
+    issues.push({
+      code: "MODULE_ID_RESERVED",
+      message: `Module ID ${manifest.id} is reserved: the platform uses /${manifest.id} for its own pages and routes.`,
+      moduleDirectory: directoryName,
+      moduleId: manifest.id,
+      path: "id",
+    });
+  }
+
   const artifacts = await resolveEntrypoints(moduleDirectory, directoryName, manifest, issues);
   if (!artifacts) {
     return undefined;

core/src/modules/index.ts

@@ -13,6 +13,7 @@ export * from "./module-package-host.js";
 export * from "./module-package-verification.js";
 export * from "./permissions.js";
 export * from "./realtime.js";
+export * from "./reserved-ids.js";
 export * from "./runtime.js";
 export * from "./schema-discovery.js";
 export * from "./ui-publication.js";

core/src/modules/reserved-ids.ts

@@ -0,0 +1,33 @@
+/**
+ * Top-level names the platform owns, which therefore can never be a module id (ADR 0057).
+ *
+ * Every module with a Dashboard UI is addressed at `/<module-id>`, beside the platform's own
+ * top-level namespaces in one URL space. A module called `settings` would collide with the
+ * Dashboard's Settings pages, and one called `api` with the API itself. This is the complete set the
+ * platform serves today, not a guess at what it might want later:
+ *
+ * - `api` — the API: identity, principal, health, Core resources, module routes, module UI artifacts,
+ *   display descriptors, and realtime (`/api/…`);
+ * - `assets` — the Dashboard's and display host's scripts (`/assets/ekklesia-dashboard/…`,
+ *   `/assets/ekklesia-display/…`);
+ * - `display` — the display host's pages and service worker (`/display/…`);
+ * - `settings` and `account` — the Dashboard's own Settings and account areas.
+ *
+ * `apps/api` holds the list to the routes it actually registers, and to the Dashboard namespaces the
+ * shell interprets, so a new top-level platform route cannot be added without reserving it here.
+ * Reserving a name is a breaking change for any installation with a module of that id, so the set
+ * grows only deliberately.
+ */
+export const RESERVED_MODULE_IDS = Object.freeze([
+  "account",
+  "api",
+  "assets",
+  "display",
+  "settings",
+] as const);
+
+const reserved: ReadonlySet<string> = new Set(RESERVED_MODULE_IDS);
+
+export function isReservedModuleId(moduleId: string): boolean {
+  return reserved.has(moduleId);
+}

core/tests/module-discovery.test.ts

@@ -4,8 +4,10 @@ import path from "node:path";
 import { afterEach, describe, expect, it } from "vitest";
 import {
   discoverModules,
+  isReservedModuleId,
   ModuleDiscoveryError,
   type ModuleDiscoveryIssueCode,
+  RESERVED_MODULE_IDS,
 } from "../src/modules/index.js";
 
 interface ModuleFixtureOptions {
@@ -271,6 +273,52 @@ describe("module discovery", () => {
     );
   });
 
+  it("rejects a module whose id is one of the platform's reserved top-level names (ADR 0057)", async () => {
+    // Every module with a Dashboard UI is addressed at `/<module-id>`, so an id equal to a
+    // platform-owned top-level namespace would collide with the API, the display host, a host
+    // script, or a Dashboard page.
+    expect(RESERVED_MODULE_IDS).toEqual(["account", "api", "assets", "display", "settings"]);
+    expect(Object.isFrozen(RESERVED_MODULE_IDS)).toBe(true);
+
+    for (const id of RESERVED_MODULE_IDS) {
+      const modulesDirectory = await createModulesDirectory();
+      await createModule(modulesDirectory, id);
+
+      const error = await discoveryError(modulesDirectory);
+
+      expect(error.issues, id).toEqual([
+        expect.objectContaining({
+          code: "MODULE_ID_RESERVED",
+          moduleDirectory: id,
+          moduleId: id,
+          path: "id",
+        }),
+      ]);
+    }
+  });
+
+  it("accepts ids that merely resemble a reserved name", async () => {
+    const modulesDirectory = await createModulesDirectory();
+    for (const id of ["settings-sync", "my-account", "displays", "api-docs"]) {
+      await createModule(modulesDirectory, id);
+    }
+
+    const modules = await discoverModules({
+      moduleSdkVersion: "0.1.0",
+      modulesDirectory,
+      platformVersion: "0.1.0",
+    });
+
+    expect(modules.map((module) => module.manifest.id).sort()).toEqual([
+      "api-docs",
+      "displays",
+      "my-account",
+      "settings-sync",
+    ]);
+    expect(isReservedModuleId("settings")).toBe(true);
+    expect(isReservedModuleId("settings-sync")).toBe(false);
+  });
+
   it("enforces platform and Module SDK compatibility", async () => {
     const modulesDirectory = await createModulesDirectory();
     await createModule(modulesDirectory, "future", {

deploy/Caddyfile.example

@@ -42,9 +42,16 @@
 
 {$EKKLESIA_HOSTNAME} {
 	# Everything the API serves: the Dashboard at /, the API, display pages and their service
-	# worker, and the Dashboard and display host scripts. Any other path is refused here.
+	# worker, and the Dashboard and display host scripts.
 	@ekklesia path / /api/* /display/* /assets/*
 
+	# The Dashboard's other pages (ADR 0057): its own Settings and account pages, and each installed
+	# module's page at /<module-id> (/signage, and later /signage/timelines), so a refreshed deep link
+	# stays put. Module ids are installation-specific, so this forwards every top-level name shaped
+	# like one and the API decides: the Dashboard page where one exists, its sanitized 404 elsewhere.
+	# Any other path is refused here.
+	@dashboardPage path_regexp dashboardPage ^/[a-z][a-z0-9]*(?:-[a-z0-9]+)*(?:/.*)?$
+
 	# Module realtime is Server-Sent Events: flush every event immediately.
 	@realtime path /api/v1/module-realtime/*
 
@@ -63,6 +70,12 @@
 		}
 	}
 
+	handle @dashboardPage {
+		reverse_proxy api:3000 {
+			import ekklesia_forwarding
+		}
+	}
+
 	handle {
 		respond 404
 	}

deploy/Caddyfile.split.example

@@ -51,12 +51,28 @@
 {$EKKLESIA_DASHBOARD_HOSTNAME} {
 	@dashboard path / /assets/ekklesia-dashboard/*
 
+	# The Dashboard's other pages (ADR 0057): its own Settings and account pages, and each installed
+	# module's page at /<module-id> (/signage, and later /signage/timelines), so a refreshed deep link
+	# stays put. Module ids are installation-specific, so this forwards every top-level name shaped
+	# like one and the API decides: the Dashboard page where one exists, its sanitized 404 elsewhere.
+	# The API's own namespaces stay refused on this hostname.
+	@dashboardPage {
+		path_regexp dashboardPage ^/[a-z][a-z0-9]*(?:-[a-z0-9]+)*(?:/.*)?$
+		not path /api /api/* /display /display/* /assets /assets/*
+	}
+
 	handle @dashboard {
 		reverse_proxy api:3000 {
 			import ekklesia_forwarding
 		}
 	}
 
+	handle @dashboardPage {
+		reverse_proxy api:3000 {
+			import ekklesia_forwarding
+		}
+	}
+
 	handle {
 		respond 404
 	}

deploy/README.md

@@ -241,6 +241,14 @@ Module storage is installation state: back it up with the database and the bucke
    `docker compose run --rm migrate node core/dist/cli/apply-migrations.js`.
 5. **Restart on the new image:** `docker compose -f compose.yaml -f compose.proxy.yaml up -d --wait`.
 
+**Upgrading to a release with Dashboard page addresses (ADR 0057):** compare your `Caddyfile` with
+the new `Caddyfile.example` (or `Caddyfile.split.example`). Each gains a `@dashboardPage` matcher
+and `handle` block that forward every top-level path shaped like a module id — `/settings`,
+`/account`, and each installed module's page such as `/signage` — to the API, which answers with
+the Dashboard page where one exists and its sanitized `404` elsewhere. Without it the Dashboard still
+opens at `/`, but refreshing or bookmarking any other Dashboard page is the proxy's `404`. Reload the
+proxy after editing it. Installing or removing a module needs no proxy change.
+
 ### Rolling back
 
 Set `EKKLESIA_IMAGE` back to the previous tag and run `up -d --wait` again. That is enough only when
@@ -263,7 +271,7 @@ The same image serves both; only configuration differs.
 
 | Hostname | Serves | Refuses (`404`) |
 | --- | --- | --- |
-| Dashboard (`EKKLESIA_DASHBOARD_HOSTNAME`) | `/` and `/assets/ekklesia-dashboard/*` | everything else, including `/api/*` |
+| Dashboard (`EKKLESIA_DASHBOARD_HOSTNAME`) | `/`, `/assets/ekklesia-dashboard/*`, and every module-shaped top-level path (the Dashboard's pages, such as `/settings` and `/signage`; the API answers the rest with its `404`) | everything else, including `/api/*`, `/display/*`, and `/assets/*` |
 | API (`EKKLESIA_HOSTNAME`) | `/api/*`, `/display/*`, `/assets/ekklesia-display/*` | everything else, including `/` |
 | Storage (`EKKLESIA_STORAGE_HOSTNAME`) | signed object URLs, unchanged | |
 
@@ -339,7 +347,11 @@ networks:
 
 Then make your proxy do what `Caddyfile.example` does:
 
-- forward `/`, `/api/*`, `/display/*`, and `/assets/*` on the Ekklesia hostname to `api:3000`;
+- forward `/`, `/api/*`, `/display/*`, and `/assets/*` on the Ekklesia hostname to `api:3000`,
+  and every path whose first segment is shaped like a module id, `^/[a-z][a-z0-9]*(?:-[a-z0-9]+)*(?:/.*)?$` (ADR 0057): that is
+  `/settings`, `/account`, and each installed module's page such as `/signage`, and the API answers
+  anything that is not a real page with its sanitized `404`. Without it, refreshing any Dashboard page
+  other than `/` is your proxy's `404`. Do not list module ids: they change as modules are installed;
 - **overwrite** `X-Forwarded-For` with the one client address it resolved, and strip
   `CF-Connecting-IP`, `X-Real-IP`, `Forwarded`, and `True-Client-IP`;
 - stream responses on `/api/v1/module-realtime/*` without buffering (Server-Sent Events);
@@ -405,7 +417,7 @@ deployment:
 
 | # | Item | Where it is met |
 | --- | --- | --- |
-| 1 | The proxy forwards the Dashboard and `/api` on the intended origin | `Caddyfile.example` routes `/`, `/api/*`, `/display/*`, `/assets/*` on one hostname to `api`; the API serves the Dashboard itself. In the split topology, `Caddyfile.split.example` gives each hostname exactly its own paths and the exact trusted-origin CORS of ADR 0045 covers the rest. |
+| 1 | The proxy forwards the Dashboard and `/api` on the intended origin | `Caddyfile.example` routes `/`, `/api/*`, `/display/*`, `/assets/*`, and every module-shaped top-level path (the Dashboard's pages) on one hostname to `api`; the API serves the Dashboard itself. In the split topology, `Caddyfile.split.example` gives each hostname exactly its own paths and the exact trusted-origin CORS of ADR 0045 covers the rest. |
 | 2 | The origin port is unreachable from the Internet | The base publishes no port; only `proxy` publishes 80 and 443. |
 | 3 | The origin port is unreachable from untrusted networks | `api` is reachable only on Docker networks; `EKKLESIA_PUBLISH_ADDRESS` limits the proxy to one interface. Firewall the host itself. |
 | 4 | The proxy overwrites the trusted client-IP header | `header_up X-Forwarded-For {client_ip}` in `Caddyfile.example`. |

docs/architecture/decisions/0026-minimal-ekklesia-module-ui-host.md

@@ -267,6 +267,8 @@ to follow — and the API never builds frontend source at run time.
   and its only allowed build script, and a second toolchain buys HMR that a proof does not need.
 - **A client router.** Rejected: a selected-module state is sufficient, and host routing versus
   module routing is a design this pass should not settle by accident.
+  > **Cross-reference — see [ADR 0057](0057-dashboard-urls-are-host-owned-routes.md).** The Dashboard
+  > now has host-owned URL routing; module routing remains a separate, deferred decision.
 - **`react-router-dom`.** Rejected outright — modules are denied it precisely because routing belongs
   to the host, and adopting it here for a two-item selector would prejudge that design.
 - **Clearing the container between selections instead of keying the frame.** Rejected: it leaves one

docs/architecture/decisions/0027-dashboard-navigation-and-flat-modules.md

@@ -255,6 +255,10 @@ that is unremarkable, and it is measured work rather than hidden.
 
 ## Deferred
 
+> **Cross-reference — see [ADR 0057](0057-dashboard-urls-are-host-owned-routes.md).** Client-side
+> routing and deep links to a selected module, deferred below, have landed; the rest of this list is
+> unchanged.
+
 Not implemented or promised here: the navigation **editor** — drag and drop, a management UI, and any
 administrator-facing affordance beyond the API; nested folders and subgroups; icons, colors, badges,
 and module descriptions in navigation; `suggestedGroup` and any configuration-initialization or

docs/architecture/decisions/0034-host-owned-browser-authentication.md

@@ -165,6 +165,10 @@ redirect target.
 A future client router may define an internal return-location contract, but it must be a separately
 validated, same-origin route decision. This pass does not create one speculatively.
 
+> **Cross-reference — see [ADR 0057](0057-dashboard-urls-are-host-owned-routes.md).** The Dashboard
+> now has a host-owned router. It adds no return-location contract: sign-in still happens in place at
+> the current URL, which is now a real page address.
+
 ### Cookie and origin policy does not broaden for the Dashboard
 
 The session cookie keeps the identity platform's existing properties: HttpOnly, SameSite=Lax,

docs/architecture/decisions/0057-dashboard-urls-are-host-owned-routes.md

@@ -0,0 +1,237 @@
+# 0057: Dashboard URLs are real, host-owned routes
+
+- Status: Accepted
+- Date: 2026-10-14
+- Extends: [0026](0026-minimal-ekklesia-module-ui-host.md),
+  [0027](0027-dashboard-navigation-and-flat-modules.md),
+  [0034](0034-host-owned-browser-authentication.md),
+  [0044](0044-self-hosted-reference-deployment.md),
+  [0045](0045-split-dashboard-and-api-origins.md)
+
+## Context
+
+The Dashboard had exactly one URL. `apps/api` served the page at `/` and nowhere else, both
+reference proxies forwarded only `/` to it, and the shell kept "which module is open" in React state.
+Opening a module never changed the address bar, so a refresh always returned to the first module,
+nothing could be bookmarked or shared, and the browser's Back button left the Dashboard entirely.
+ADR 0026 rejected a client router *for that pass* — "a selected-module state is sufficient" — and
+ADR 0027 deferred client routing and deep links.
+
+The product contract now requires them. DESIGN.md §2.7 says the URL represents the current place in
+the product: a refresh returns to the same page, deep links work, Back and Forward behave
+predictably. §5 makes an **Overview** the Dashboard's landing page, and §12.6 says a disabled module's
+routes stop behaving as active routes. Everything else Stage 1 builds — the sidebar, Settings, the
+account area, platform Displays, a module's own pages in the sidebar, and returning to the workflow a
+Settings deep link came from — needs stable addresses to hang from, so this is the first slice.
+
+A route that works in the shell but not on refresh is worse than no route, because it looks like it
+works. Refresh is a server and proxy concern before it is a browser one: the API had to serve the
+page at the new paths, and the proxies had to forward them.
+
+## Decision
+
+### One top-level URL space, shared by platform pages and module pages
+
+```text
+/                          the Overview
+/settings[/…]              Settings
+/account[/…]               the account area
+/<module-id>               a module's page: /signage, /calendar, /people
+/<module-id>/<page>[/…]    reserved for that module's own pages: /signage/timelines
+```
+
+A module is a first-class top-level destination, addressed by its id, exactly as Settings and the
+Account area are. "Module" is an implementation concept — how the platform packages a product — and
+it does not appear in the addresses people see, bookmark, and share. A module id is lowercase
+kebab-case and Core-validated, which is what makes it usable as a path segment with no further
+encoding.
+
+### Platform-owned top-level names are reserved, and Core enforces it
+
+Sharing one namespace means a module must never be able to take a name the platform uses.
+`RESERVED_MODULE_IDS` (`core/src/modules/reserved-ids.ts`) is the complete set the platform serves
+at the top level **today**, taken from what is actually registered rather than from guesses:
+
+| Name | Owned by |
+| --- | --- |
+| `api` | the API: identity, principal, health, Core resources, module routes, module UI artifacts, display descriptors, realtime |
+| `assets` | the Dashboard's and display host's scripts |
+| `display` | the display host's pages and service worker |
+| `settings` | the Dashboard's Settings pages |
+| `account` | the Dashboard's account area |
+
+Discovery refuses a module that declares one (`MODULE_ID_RESERVED`), so the check covers API
+startup, `pnpm modules:validate`, and Module Package verification — before a module is installed,
+not only when it is served. Exact names only: `settings-sync` or `displays` are ordinary ids.
+
+The set is held to reality by tests in `apps/api` rather than by review: every top-level segment the
+composed API registers is a reserved name or a module page, the display host's and Dashboard
+script's path constants all start with a reserved name, and every Dashboard page the shell
+interprets is reserved. Adding a new top-level platform route therefore fails a test until its name
+is reserved. Reserving a name later is a **breaking change** for any installation with a module of
+that id, so the set grows only deliberately, and only for a real route.
+
+The rule lives in Core's discovery rather than in the module manifest grammar
+(`@ekklesia/contracts`), because it is the Ekklesia host's URL space, not a property of a module: a
+standalone host (ADR 0021) has no Settings page to protect. A module built against the current
+public packages is unaffected unless it uses one of these five names.
+
+### The server serves one page, unchanged, at every real Dashboard address — and nowhere else
+
+`createDashboardHostRoutes` answers `GET` (and Hono's implicit `HEAD`) at `/`, at `/settings` and
+`/account` and everything below each (`DASHBOARD_PLATFORM_PAGES`, exported by the shell as
+`@ekklesia/shell/dashboard-routes`, so the server and the shell's router read one list), and at
+`/<module-id>` and everything below it for **each module this process discovered that declares a
+Dashboard UI**. Every answer is the same frozen bytes, the same strong `ETag`, and the same security
+headers as `/`: the path selects a page inside the shell, never a file on the server. Nothing from
+the request is composed into a lookup, no directory is exposed, and the script and source map remain
+reachable only at their own literal paths.
+
+The module set is the boot snapshot's discovered inventory, fixed at startup like every other
+module-derived route, and it deliberately **includes disabled and blocked modules**. A bookmark to a
+module an administrator turned off still opens the Dashboard, which says the module is unavailable;
+that is more useful than an address that suddenly looks like it never existed. A module that is not
+installed, or that has no Dashboard UI (a display-only module, ADR 0033), has no page.
+
+Everything else stays the sanitized `404`: an arbitrary root path (`/definitely-not-a-real-module`),
+a look-alike (`/settings-old`, `/signages`), another method, `/index.html`, and so on. The routes
+also refuse to compose if handed a module page that is not a valid module id, is a reserved name, or
+appears twice — discovery already guarantees all three, and the routes do not trust it.
+
+Serving `/<module-id>` before sign-in means an anonymous request can learn whether a module with a
+Dashboard UI is installed, by its `200` or `404`. That is accepted: it is the same disclosure the
+display host already makes at `/display/<module-id>` (ADR 0033), a module id names a product rather
+than any data, and the alternative — a page at every module-shaped root path — is exactly the
+"arbitrary path becomes a Dashboard page" this decision rejects. The authenticated module inventory
+and every module route keep their authorization unchanged.
+
+### The proxies forward module-shaped names and let the API decide
+
+A proxy cannot know which modules an installation has, and a proxy configuration listing them would
+have to be edited on every install. Both reference Caddyfiles therefore forward every top-level path
+whose first segment has a module id's shape, `^/[a-z][a-z0-9]*(?:-[a-z0-9]+)*(?:/.*)?$`, and the API
+answers it with the page or its sanitized `404`. Anything not shaped like one — `/favicon.ico`,
+`/.well-known/…`, an uppercase name — is still refused by the proxy without reaching the API. In the
+split topology (ADR 0045) the Dashboard hostname forwards module-shaped names but still refuses
+`/api`, `/display`, and `/assets`, and the API hostname still serves no Dashboard page. The
+development server falls back to the page for any path with no file.
+
+### The shell's router is host-owned, small, and deliberately not a library
+
+The address bar is the source of truth for which page is open. The shell reads it through a
+four-method `HostHistory` (`pathname`, `push`, `replace`, `subscribe`); the browser implementation is
+built in the entry point from `window` and handed down, so the entry point remains the only file in
+the package that touches a browser global, and every routing behaviour is tested against an in-memory
+history whose entries a test can inspect. No state object is ever stored in a history entry — the path
+alone is meaningful — so nothing put into history can be read back as authority.
+
+`react-router-dom` is not adopted. Modules are refused it because routing belongs to the host
+(ADR 0022, `pnpm boundaries`); the shell's own pages are a handful of host screens plus one mounted
+module; and adopting a library now would prejudge how a module's own pages are addressed, which is
+a separate decision (see **Deferred**).
+
+### What each path shows
+
+- `/` is the **Overview**. The shell no longer opens the first module for the person: the Overview is
+  the landing page. Until modules can contribute cards to it, it says plainly that it has nothing to
+  show yet.
+- `/<module-id>` mounts the module whose navigation entry has that id, through the unchanged generic
+  loader and the unchanged keyed frame, so a stale load still cannot reach a newer page. The server's
+  navigation is the only authority on what is mountable. An id it does not list — a disabled or
+  blocked module whose address the server still serves — shows *This page isn't available* and loads
+  nothing; the page never echoes the address back. This is what makes a disabled module's routes stop
+  behaving as active routes, with no new server state.
+- `/settings…` and `/account…` are the platform's own pages and are never read as module pages. They
+  have no content yet, so they show *Page not found* for now.
+- Everything below `/<module-id>/` belongs to that module's own pages. It is served by the API today
+  and shows *Page not found* in the shell until the module page contract exists. The shell never
+  guesses, and never shows a module's first page for an address the module never defined.
+- One trailing slash is tolerated and corrected to the canonical spelling in place (`replace`, no new
+  entry), so what is bookmarked next is the one canonical address.
+
+### Navigation is real links
+
+Every navigation item is an `<a href>` with its canonical address and `aria-current="page"` when it
+is open, marked by weight as well as colour. An ordinary click opens the page in place and adds one
+history entry; a click with a modifier key or the middle button is left to the browser, so a page can
+be opened in a new tab. Clicking the open page's own link adds no entry. The browser's Back and Forward
+walk exactly the pages that were open.
+
+### Page changes behave like page loads for assistive technology
+
+After an in-place page change the shell moves focus to the page's `<main>` (named after the page) as
+a full load would have; the first page shown after a refresh or sign-in is left alone. The entry point
+names the browser tab after the open page ("Overview", the module's display name, or the error page's
+title, and "Sign in" while signed out) — never "Ekklesia", in keeping with ADR 0046. The static page's
+own `<title>` is unchanged here; it belongs to the branding work.
+
+### Sign-in is unchanged, and still has no return URL
+
+ADR 0034 holds exactly. The sign-in form still replaces the application in place at the current URL,
+so a deep link opened while signed out lands on its own page once the person signs in — with no
+`return`, `next`, or callback value, no redirect, and no script-driven navigation off the
+Dashboard's own paths. The shell only ever moves between its own canonical paths. Emailed
+verification and reset links still land on `/` with a query (ADR 0038).
+
+## Alternatives
+
+- **Module pages under a prefix (`/modules/<id>`).** Rejected: it exposes an implementation concept
+  in every address people see, and makes a module a second-class destination beside Settings. The
+  collision it avoided is handled instead by reserving the platform's names in Core.
+- **Hash routing (`/#/signage`).** Rejected: every address is one page to the server, the proxy, and
+  any analytics; fragments never reach the server, so no server-side decision about a path is
+  possible; and DESIGN.md asks for real URLs.
+- **Serving the page at any module-shaped root path.** Rejected: `/definitely-not-a-real-module`
+  would become a Dashboard page, and the server would answer `200` for every mistyped address. It
+  would remove the installed-module disclosure described above, at the cost of the server no longer
+  meaning anything by a `200`.
+- **Serving only enabled, running modules' pages.** Rejected: a bookmark to a module an
+  administrator disabled would become a bare `404`, indistinguishable from a typo, instead of the
+  Dashboard explaining that the module is unavailable.
+- **Listing modules in the proxy configuration.** Rejected: every install would need a proxy edit.
+- **Reserving more names now** (`login`, `help`, `overview`, …) "just in case". Rejected: a reserved
+  name refuses a real module, so a name is reserved when the platform gets a route there and not
+  before.
+- **Putting the reserved names in the manifest grammar.** Rejected for now: it is the Ekklesia host's
+  URL space, not a module property, and would need a public-contract release for no extra safety,
+  since discovery already refuses the module before it can be installed.
+- **`react-router-dom` or another routing library.** Rejected for now; see above.
+- **Keeping "open the first module" at `/`.** Rejected: DESIGN.md makes the Overview the landing page,
+  and an address that silently means "whatever happens to be first" is not a stable address.
+
+## Consequences
+
+- A refresh, a bookmark, and a shared link land on the page that was open; Back and Forward walk the
+  Dashboard's own pages. Proven at three levels: the shell against an in-memory history; `apps/api`
+  serving the page at platform pages and installed modules' pages and the sanitized `404` everywhere
+  else; and the deploy smoke test, through the real proxy, checking platform deep links, unknown
+  names, a module's address staying served while the module is disabled and disappearing and
+  returning as it is removed and reinstalled,
+  and reloading a module's address in a real browser and requiring the same module to mount again.
+- **The Dashboard opens on the Overview, not on the first module.** A person who used to land in
+  Signage now chooses it once from the navigation, and can bookmark `/signage`.
+- **A module may not be called `account`, `api`, `assets`, `display`, or `settings`.** No known module
+  is; one that was would now fail discovery with `MODULE_ID_RESERVED` and must be renamed.
+- **Operators with their own proxy must forward module-shaped top-level paths** (the matcher above),
+  or a refresh on any page other than `/` is the proxy's `404`. The deployment guide says so.
+- `@ekklesia/shell` gains a `./dashboard-routes` subpath, and `apps/api` reads it. The surface remains
+  private; this is the same relationship `./dashboard-assets` already has.
+- The navigation landmark is labelled "Dashboard" rather than "Modules", because it now contains the
+  Overview as well as modules.
+
+## Deferred
+
+Each of these needs its own decision. This ADR reserves the addresses for them and decides none of
+them:
+
+- **A module's own pages** — how a module declares the pages that appear under it in the sidebar
+  (`/signage/playback`, `/signage/timelines`, `/signage/displays`), how it learns and changes its
+  current sub-path through the module UI SDK, and what an address below `/<module-id>/` means. The
+  server already serves the page there and the proxies already forward it, so that contract is a
+  manifest, SDK, and shell change with no further routing or deployment change. It is its own ADR.
+- **Return to origin** — how a module or a Settings page links into another part of the Dashboard and
+  comes back to the exact workflow that sent the person there (DESIGN.md §2.7, §4.8). It must remain
+  a validated, same-origin route decision, as ADR 0034 requires, and is designed with the module page
+  contract rather than here.
+- The Settings and Account pages themselves, the sidebar redesign, the mobile drawer, Overview cards,
+  breadcrumbs, and the installation's name in the browser tab.

docs/architecture/decisions/README.md

@@ -65,3 +65,4 @@ ADRs capture durable choices that affect more than one package or phase.
 - [0054: Ekklesia's module-development packages are publicly readable before launch](0054-public-package-reads-before-launch.md) — Accepted
 - [0055: Native redistributable packages carry corresponding-source artifacts](0055-corresponding-source-artifacts.md) — Accepted
 - [0056: A device credential lasts while the device is in use](0056-device-credentials-last-while-in-use.md) — Accepted
+- [0057: Dashboard URLs are real, host-owned routes](0057-dashboard-urls-are-host-owned-routes.md) — Accepted

docs/architecture/platform-architecture.md

@@ -343,7 +343,9 @@ permission the inventory does; organizing requires the new platform permission
 shell renders that arrangement and computes none of it.
 
 **Still not the finished Dashboard.** No editor or drag and drop, no nested folders, no icons, no
-Dashboard Home or widgets, no design system, and no client routing. A production CSP and deployment
+Dashboard Home or widgets, no design system, and no client routing (client routing and an Overview
+landing page have since landed; see
+[ADR 0057](decisions/0057-dashboard-urls-are-host-owned-routes.md)). A production CSP and deployment
 for the built shell, general asset publication, and the standalone host remain future work. Phase 7B
 pass 1 later supplies the host-owned sign-in flow described below.
 Restart-based discovery, explicit operator-invoked migrations, and the trusted compiled-module model

docs/development/api.md

@@ -259,6 +259,16 @@ redirect target and performs no post-login navigation, so external and protocol-
 have no redirect sink in this pass. See
 [ADR 0034](../architecture/decisions/0034-host-owned-browser-authentication.md).
 
+Since [ADR 0057](../architecture/decisions/0057-dashboard-urls-are-host-owned-routes.md) that URL
+is a real page address: the API serves the Dashboard page at `/`, at `/settings` and `/account`, and
+at `/<module-id>` for every discovered module that declares a Dashboard UI (enabled or not) — each
+bare and with everything below it — with the same bytes, validator, and headers as `/`. A deep link
+opened while signed out therefore shows the sign-in form at that address and opens its own page once
+the person signs in — still with no return value and no redirect. Any other path — a module that is
+not installed, a display-only module, a look-alike such as `/settings-old` — remains the sanitized
+`404`. Module ids `account`, `api`, `assets`, `display`, and `settings` are reserved for the platform
+and refused by discovery (`MODULE_ID_RESERVED`).
+
 ### The four anonymous screens
 
 The shell's unauthenticated surface is a small explicit union, not a client-side router: sign-in,

docs/module-development/README.md

@@ -535,7 +535,12 @@ without executing module code:
 }
 ```
 
-Module, capability, and permission identifiers are lowercase and namespaced. A provided capability
+Module, capability, and permission identifiers are lowercase and namespaced. A module with a
+Dashboard UI is addressed at `/<module-id>` — `/calendar` for this one
+([ADR 0057](../architecture/decisions/0057-dashboard-urls-are-host-owned-routes.md)) — in the same
+top-level URL space as the platform's own pages, so a few ids are **reserved** and Core refuses a
+module that declares one (`MODULE_ID_RESERVED`, reported by discovery, `pnpm modules:validate`, and
+package verification): `account`, `api`, `assets`, `display`, and `settings`. A provided capability
 has its own exact semantic version because its public contract can evolve independently from the
 module release. Capability dependencies use semantic-version ranges. Optional means the provider
 may be absent; if it is installed, its capability version must be compatible.

scripts/lib/deploy-smoke-browser.mjs

@@ -187,7 +187,9 @@ check(
 );
 
 // --- A module UI, imported from the API's origin -------------------------------------------------
-const moduleButton = "document.querySelector('[data-testid^=\"select-\"]')";
+// The first module link — never the Overview, which is the Dashboard's own landing page (ADR 0057).
+const moduleButton =
+  'document.querySelector(\'[data-testid^="select-"]:not([data-testid="select-overview"])\')';
 const hasModule = await waitFor(moduleButton, "a module in the Dashboard navigation");
 if (hasModule) {
   const moduleId = await evaluate(`${moduleButton}.dataset.testid.slice("select-".length)`);
@@ -224,6 +226,20 @@ if (hasModule) {
     streams.every((response) => response.status === 200),
     `every realtime stream it opened was accepted (${streams.length} opened)`,
   );
+
+  // A refresh stays on the module's own page: the proxy forwards the deep link, the API serves the
+  // Dashboard page there, and the shell mounts the same module again (ADR 0057).
+  const moduleUrl = await evaluate("location.href");
+  check(
+    moduleUrl === `${dashboardOrigin}/${moduleId}`,
+    "opening the module put its own address in the address bar",
+  );
+  await navigate(moduleUrl);
+  const remounted = await waitFor(
+    `location.href === ${JSON.stringify(moduleUrl)} && ${selector(`select-${moduleId}`)}?.getAttribute("aria-current") === "page" && ${selector("module-container")}?.childElementCount > 0 && !${selector("module-loading")} && !${selector("module-error")}`,
+    "the module UI to mount again after a refresh",
+  );
+  check(remounted, `refreshing ${moduleUrl} reopens the ${moduleId} module`);
 }
 // A CORS refusal or a blocked request is always a failure. A request the page itself cancelled (a
 // module unmounting, a navigation) is not.

scripts/lib/deploy-smoke-client.mjs

@@ -88,6 +88,27 @@ async function edgeChecks() {
     "the Dashboard page names the API's origin, rendered at run time (ADR 0045)",
   );
 
+  // Every Dashboard page answers with that same page, so a refresh stays put (ADR 0057). No module
+  // is installed yet at this point; a module's own address is reloaded in a real browser later.
+  for (const deepLink of ["/settings", "/settings/displays/add", "/account"]) {
+    const deepPage = await fetch(`${dashboardOrigin}${deepLink}`);
+    check(
+      deepPage.status === 200 &&
+        deepPage.headers.get("etag") === page.headers.get("etag") &&
+        (await deepPage.text()) === html,
+      `GET ${deepLink} through the proxy is the same Dashboard page`,
+    );
+  }
+  // A top-level name shaped like a module id reaches the API, which knows the installed modules and
+  // answers anything that is not a Dashboard page with its sanitized 404 — never the page.
+  for (const unknown of ["/definitely-not-a-real-module", "/settings-old", "/modules/example"]) {
+    const response = await fetch(`${dashboardOrigin}${unknown}`);
+    check(
+      response.status === 404 && (await response.text()) === '{"code":"NOT_FOUND"}',
+      `GET ${unknown} through the proxy is the API's sanitized 404, not a Dashboard page`,
+    );
+  }
+
   const script = await fetch(`${dashboardOrigin}/assets/ekklesia-dashboard/app.js`);
   await script.arrayBuffer();
   check(script.status === 200, "GET /assets/ekklesia-dashboard/app.js is 200");
@@ -152,6 +173,10 @@ async function splitRoutingChecks() {
     "the Dashboard hostname refuses /display/*",
   );
   check(await refusedByProxy(`${apiOrigin}/`), "the API hostname serves nothing at /");
+  check(
+    await refusedByProxy(`${apiOrigin}/settings/displays`),
+    "the API hostname serves no Dashboard page either",
+  );
   check(
     await refusedByProxy(`${apiOrigin}/assets/ekklesia-dashboard/app.js`),
     "the API hostname refuses the Dashboard's script",
@@ -491,6 +516,25 @@ async function moduleChecks() {
     check(installed, `the module inventory lists the \`${moduleId}\` module`);
   }
 
+  // The module's own Dashboard address (ADR 0057) exists exactly while the module is installed with a
+  // Dashboard UI — disabled or not: the Dashboard page when it is, the API's sanitized 404 when it is
+  // not. A disabled module is not running, but its address still opens the Dashboard.
+  const pageExpectation =
+    optional("SMOKE_MODULE_PAGE") || (expectation === "absent" ? "absent" : "served");
+  const modulePage = await fetch(`${dashboardOrigin}/${moduleId}`);
+  const modulePageBody = await modulePage.text();
+  if (pageExpectation === "absent") {
+    check(
+      modulePage.status === 404 && modulePageBody === '{"code":"NOT_FOUND"}',
+      `GET /${moduleId} is the sanitized 404 while the module is not installed`,
+    );
+  } else {
+    check(
+      modulePage.status === 200 && modulePageBody.includes('id="ekklesia-host"'),
+      `GET /${moduleId} through the proxy is the Dashboard page while the module is installed`,
+    );
+  }
+
   if (moduleId === "example") {
     const records = await fetch(`${apiOrigin}/api/v1/modules/example/records`, { headers });
     if (expectation === "absent") {

scripts/smoke-deploy.sh

@@ -543,9 +543,13 @@ recreate_api() {
   fi
 }
 
-# module_check <expectation>: "absent", or the exact JSON array of values `example` must return.
+# module_check <expectation> [page]: "absent", or the exact JSON array of values `example` must
+# return. `page` is whether its Dashboard address is served (ADR 0057): by default, exactly when the
+# module is running; "served" for a module that is installed but disabled, whose address still opens
+# the Dashboard so it can say the module is unavailable.
 module_check() {
   client module --ip "$module_client_address" -e SMOKE_MODULE_EXPECT="$1" \
+    -e SMOKE_MODULE_PAGE="${2:-}" \
     -e SMOKE_MODULE_ID="$module_id" -e SMOKE_MODULE_PROBE_PATH="$module_probe_path" \
     -e SMOKE_OWNER_EMAIL="$owner_email" -e SMOKE_OWNER_PASSWORD="$owner_password"
 }
@@ -729,7 +733,7 @@ if [[ "$topology" == split ]]; then
   step "Disabling and re-enabling the module through the supported lifecycle command"
   restart_api "${compose[@]}" run --rm --no-deps migrate node \
     core/dist/cli/set-module-enabled.js --disable --module "$module_id"
-  module_check absent || fail "the disabled module was still reported as running."
+  module_check absent served || fail "the disabled module was still reported as running."
   module_storage "test -d /modules/${module_id}" ||
     fail "disabling the module removed its installed package."
   restart_api "${compose[@]}" run --rm --no-deps migrate node \

surfaces/shell/package.json

@@ -16,6 +16,10 @@
       "types": "./dist/dashboard-assets.d.ts",
       "import": "./dist/dashboard-assets.js"
     },
+    "./dashboard-routes": {
+      "types": "./dist/dashboard-routes.d.ts",
+      "import": "./dist/dashboard-routes.js"
+    },
     "./display-assets": {
       "types": "./dist/display-assets.d.ts",
       "import": "./dist/display-assets.js"

surfaces/shell/scripts/build-browser.mjs

@@ -89,7 +89,13 @@ await copyFile(
 if (serve) {
   const context = await esbuild.context(buildOptions);
   await context.watch();
-  const { host, port } = await context.serve({ servedir: outputDirectory });
+  // Any path with no file behind it gets the Dashboard page, so a refreshed deep link such as
+  // `/example` reaches the shell's router here as it does from `apps/api` (ADR 0057).
+  // Development only: the API serves the page only at its platform pages and installed modules'.
+  const { host, port } = await context.serve({
+    fallback: path.join(outputDirectory, "index.html"),
+    servedir: outputDirectory,
+  });
   console.log(`Ekklesia shell (development) on http://${host}:${port}`);
   console.log(
     apiBaseUrl === ""

surfaces/shell/src/browser/DashboardLink.tsx

@@ -0,0 +1,82 @@
+import { designToken } from "@ekklesia/design-tokens";
+import type { CSSProperties, MouseEvent, ReactElement, ReactNode } from "react";
+import { type DashboardDestination, dashboardPath } from "../dashboard-routes.js";
+import type { HostHistory } from "./host-history.js";
+
+export interface DashboardLinkProps {
+  readonly history: HostHistory;
+  readonly to: DashboardDestination;
+  readonly children: ReactNode;
+  /** Marks the link as the page currently open, for assistive technology and visually. */
+  readonly current?: boolean;
+  readonly variant?: "navigation" | "action";
+  readonly "data-testid"?: string;
+}
+
+const variantClass = {
+  action: "ek-button ek-focusable ek-button--secondary",
+  navigation: "ek-button ek-focusable ek-button--quiet",
+} as const;
+
+const navigationStyle: CSSProperties = {
+  justifyContent: "flex-start",
+  textDecoration: "none",
+  width: "100%",
+};
+
+/** The open page is shown by weight as well as colour, so it never depends on colour alone. */
+const currentStyle: CSSProperties = {
+  ...navigationStyle,
+  background: designToken("state.selected-background"),
+  color: designToken("state.selected-foreground"),
+  fontWeight: designToken("typography.weight-bold"),
+};
+
+/** A click the browser should handle itself: a new tab or window, a download, or another button. */
+function isBrowserHandledClick(event: MouseEvent<HTMLAnchorElement>): boolean {
+  return (
+    event.defaultPrevented ||
+    event.button !== 0 ||
+    event.metaKey ||
+    event.ctrlKey ||
+    event.shiftKey ||
+    event.altKey
+  );
+}
+
+/**
+ * A link to a Dashboard page, as a real `<a href>` (ADR 0057).
+ *
+ * A real link rather than a button, because it is one: it can be opened in a new tab, copied, and
+ * bookmarked, and assistive technology announces it as a link. An ordinary click opens the page in
+ * place through the shell's history instead of reloading the document; every other click — with a
+ * modifier key, or the middle button — is left to the browser.
+ */
+export function DashboardLink(props: DashboardLinkProps): ReactElement {
+  const href = dashboardPath(props.to);
+  const variant = props.variant ?? "navigation";
+  return (
+    <a
+      aria-current={props.current ? "page" : undefined}
+      className={variantClass[variant]}
+      data-testid={props["data-testid"]}
+      href={href}
+      onClick={(event) => {
+        if (isBrowserHandledClick(event)) {
+          return;
+        }
+        event.preventDefault();
+        props.history.push(href);
+      }}
+      style={
+        variant === "action"
+          ? { textDecoration: "none" }
+          : props.current
+            ? currentStyle
+            : navigationStyle
+      }
+    >
+      {props.children}
+    </a>
+  );
+}

surfaces/shell/src/browser/HostApp.tsx

@@ -1,7 +1,15 @@
 import { designToken } from "@ekklesia/design-tokens";
 import type { ModuleUiImporter } from "@ekklesia/module-ui-host";
 import { Button } from "@ekklesia/ui";
-import { type ReactElement, useCallback, useEffect, useRef, useState } from "react";
+import {
+  type ReactElement,
+  useCallback,
+  useEffect,
+  useMemo,
+  useRef,
+  useState,
+  useSyncExternalStore,
+} from "react";
 import {
   HostAuthError,
   type HostAuthLanding,
@@ -12,6 +20,7 @@ import {
   signInWithEmail,
   signOutHost,
 } from "../auth-protocol.js";
+import { type DashboardRoute, dashboardPath, parseDashboardPath } from "../dashboard-routes.js";
 import {
   bootstrapHost,
   type DashboardNavigationEntry,
@@ -20,8 +29,11 @@ import {
   HostProtocolError,
   loadHostPrincipal,
 } from "../host-protocol.js";
+import { DashboardLink } from "./DashboardLink.js";
 import { DevicePanel } from "./DevicePanel.js";
 import { ForgotPasswordForm } from "./ForgotPasswordForm.js";
+import type { HostHistory } from "./host-history.js";
+import { ModuleUnavailablePage, NotFoundPage, OverviewPage } from "./HostPages.js";
 import { LoginForm } from "./LoginForm.js";
 import { ModuleUiFrame } from "./ModuleUiFrame.js";
 import { ResetPasswordForm } from "./ResetPasswordForm.js";
@@ -101,6 +113,15 @@ export interface HostAppProps {
    * so there is nothing an open redirect could use.
    */
   readonly authLanding?: HostAuthLanding;
+  /**
+   * The address bar (ADR 0057). The current path decides which page is open, so a refresh, a
+   * bookmark, and Back and Forward all land where the person was. The entry point passes the
+   * browser's; tests pass an in-memory one. Must be a stable reference.
+   */
+  readonly history: HostHistory;
+  /** Names the browser tab after the open page. Supplied by the entry point, which owns `document`;
+   * left unset, the shell names nothing. */
+  readonly setDocumentTitle?: (title: string) => void;
   /** Test-only seam, forwarded to {@link ModuleUiFrame}. Production composition leaves it unset. */
   readonly importModule?: ModuleUiImporter;
 }
@@ -167,6 +188,8 @@ const shellStyles = {
   main: {
     boxSizing: "border-box",
     minWidth: 0,
+    // A programmatic focus target after a page change (never in the tab order), not a control.
+    outline: "none",
     overflowX: "auto",
     padding: designToken("spacing.xl"),
   },
@@ -194,25 +217,30 @@ function allEntries(bootstrap: HostBootstrap): readonly DashboardNavigationEntry
   ];
 }
 
-function ModuleButton(props: {
+function ModuleLink(props: {
   readonly entry: DashboardNavigationEntry;
-  readonly selected: boolean;
-  readonly onSelect: () => void;
+  readonly history: HostHistory;
+  readonly route: DashboardRoute;
 }): ReactElement {
+  const moduleId = props.entry.descriptor.id;
   return (
-    <Button
-      aria-current={props.selected ? "page" : undefined}
-      aria-pressed={props.selected}
-      data-testid={`select-${props.entry.descriptor.id}`}
-      onClick={props.onSelect}
-      style={{ justifyContent: "flex-start", width: "100%" }}
-      variant="quiet"
+    <DashboardLink
+      current={props.route.kind === "module" && props.route.moduleId === moduleId}
+      data-testid={`select-${moduleId}`}
+      history={props.history}
+      to={{ kind: "module", moduleId }}
     >
       {props.entry.name}
-    </Button>
+    </DashboardLink>
   );
 }
 
+/** A stable identity for "which page is showing", so a non-canonical spelling of the same page is
+ * not a page change. */
+function routeKey(route: DashboardRoute): string {
+  return route.kind === "module" ? `module:${route.moduleId}` : route.kind;
+}
+
 function HostMessage(props: {
   readonly children: string;
   readonly testId: string;
@@ -265,21 +293,27 @@ async function resolveBootstrapState(
 /**
  * The Ekklesia Dashboard shell and its host-owned authentication boundary.
  *
- * The login form replaces the protected application in place. There is no redirect parameter, URL
- * parser, location assignment, or client router in this shell, so the current internal Dashboard URL
- * simply remains the current URL through sign-in and no external/protocol-relative return value can
- * become a navigation sink. Modules receive the same five-field context after authentication; they
- * neither render platform login nor receive sign-in/sign-out controls.
+ * The login form replaces the protected application in place. There is no redirect parameter,
+ * return value, or location assignment in this shell, so the current internal Dashboard URL simply
+ * remains the current URL through sign-in — a deep link opens on its own page once the person has
+ * signed in — and no external/protocol-relative value can become a navigation sink. The shell only
+ * ever moves between its own paths (ADR 0057). Modules receive the same context after
+ * authentication; they neither render platform login nor receive sign-in/sign-out controls.
  */
 export function HostApp(props: HostAppProps): ReactElement {
   const [state, setState] = useState<BootstrapState>({ status: "loading" });
-  const [selectedKey, setSelectedKey] = useState<string | undefined>(undefined);
   const [bootstrapAttempt, setBootstrapAttempt] = useState(0);
   const activeTransitionRef = useRef<AbortController | undefined>(undefined);
   const revalidationRef = useRef<AbortController | undefined>(undefined);
   const generationRef = useRef(0);
   const mountedRef = useRef(true);
-  const { config, importModule } = props;
+  const mainRef = useRef<HTMLElement>(null);
+  const shownRouteRef = useRef<string | undefined>(undefined);
+  const { config, history, importModule, setDocumentTitle } = props;
+  const subscribe = useCallback((listener: () => void) => history.subscribe(listener), [history]);
+  const readPathname = useCallback(() => history.pathname(), [history]);
+  const pathname = useSyncExternalStore(subscribe, readPathname, readPathname);
+  const route = useMemo(() => parseDashboardPath(pathname), [pathname]);
   // Initialized once from the landing the entry point parsed. A later sign-out or a "back to sign
   // in" action moves it back to the form; nothing re-reads the URL, so a stale emailed parameter
   // cannot resurrect a screen the person has left.
@@ -306,14 +340,16 @@ export function HostApp(props: HostAppProps): ReactElement {
 
   const commitResolvedState = useCallback((resolved: ResolvedBootstrapState): void => {
     setState(resolved);
-    if (resolved.status === "ready") {
-      const first = allEntries(resolved.bootstrap)[0];
-      setSelectedKey(first ? moduleKey(first) : undefined);
-    } else {
-      setSelectedKey(undefined);
-    }
   }, []);
 
+  // A non-canonical spelling of a real page (`/example/`) is corrected in place, adding no
+  // history entry, so what is bookmarked or shared next is the one canonical address.
+  useEffect(() => {
+    if (route.kind !== "not-found" && dashboardPath(route) !== pathname) {
+      history.replace(dashboardPath(route));
+    }
+  }, [history, pathname, route]);
+
   useEffect(() => {
     mountedRef.current = true;
     return () => {
@@ -329,7 +365,6 @@ export function HostApp(props: HostAppProps): ReactElement {
     void bootstrapAttempt;
     const { controller, generation } = beginTransition();
     setState({ status: "loading" });
-    setSelectedKey(undefined);
     void resolveBootstrapState(config, controller.signal).then((resolved) => {
       if (!isCurrent(controller, generation)) {
         return;
@@ -381,7 +416,6 @@ export function HostApp(props: HostAppProps): ReactElement {
     const { controller, generation } = beginTransition();
     // The authenticated subtree disappears before the request starts. That synchronously schedules
     // ModuleUiFrame cleanup, which invokes the module's unmount and closes its realtime subscriptions.
-    setSelectedKey(undefined);
     setState({ status: "signing-out" });
     try {
       await signOutHost(config, controller.signal);
@@ -435,7 +469,6 @@ export function HostApp(props: HostAppProps): ReactElement {
             const transition = beginTransition();
             transition.controller.abort();
             activeTransitionRef.current = undefined;
-            setSelectedKey(undefined);
             setAuthView({ kind: "sign-in" });
             setState({ status: "anonymous" });
           }
@@ -451,7 +484,6 @@ export function HostApp(props: HostAppProps): ReactElement {
           const transition = beginTransition();
           transition.controller.abort();
           activeTransitionRef.current = undefined;
-          setSelectedKey(undefined);
           console.error("[ekklesia] session revalidation failed");
           setState({ status: "failed" });
         })
@@ -464,6 +496,41 @@ export function HostApp(props: HostAppProps): ReactElement {
     [beginTransition, config],
   );
 
+  const openEntry =
+    state.status === "ready" && route.kind === "module"
+      ? allEntries(state.bootstrap).find((entry) => entry.descriptor.id === route.moduleId)
+      : undefined;
+  const pageTitle =
+    state.status !== "ready"
+      ? undefined
+      : route.kind === "overview"
+        ? "Overview"
+        : route.kind === "module"
+          ? (openEntry?.name ?? "This page isn’t available")
+          : "Page not found";
+  const documentTitle = state.status === "anonymous" ? "Sign in" : pageTitle;
+
+  useEffect(() => {
+    if (documentTitle !== undefined) {
+      setDocumentTitle?.(documentTitle);
+    }
+  }, [documentTitle, setDocumentTitle]);
+
+  // Moving to another page moves keyboard and screen-reader focus to the new page's content, as a
+  // full page load would have. The first page shown after sign-in or a refresh is left alone, and a
+  // canonical respelling of the same page is not a move.
+  const currentRouteKey = routeKey(route);
+  useEffect(() => {
+    if (state.status !== "ready") {
+      shownRouteRef.current = undefined;
+      return;
+    }
+    if (shownRouteRef.current !== undefined && shownRouteRef.current !== currentRouteKey) {
+      mainRef.current?.focus();
+    }
+    shownRouteRef.current = currentRouteKey;
+  }, [currentRouteKey, state.status]);
+
   const retryBootstrap = (): void => setBootstrapAttempt((current) => current + 1);
 
   if (state.status === "loading") {
@@ -553,7 +620,6 @@ export function HostApp(props: HostAppProps): ReactElement {
 
   const { bootstrap } = state;
   const entries = allEntries(bootstrap);
-  const selected = entries.find((entry) => moduleKey(entry) === selectedKey);
   const { groups, ungrouped } = bootstrap.navigation;
 
   return (
@@ -569,56 +635,71 @@ export function HostApp(props: HostAppProps): ReactElement {
       </header>
       <aside style={shellStyles.aside}>
         <DevicePanel config={config} />
-        {entries.length === 0 && groups.length === 0 ? (
-          <p data-testid="host-empty" style={{ color: designToken("text.secondary"), margin: 0 }}>
-            No installed module provides a user interface.
-          </p>
-        ) : (
-          <nav aria-label="Modules" style={{ display: "grid", gap: designToken("spacing.xl") }}>
-            {groups.map((group) => (
-              <section data-testid={`group-${group.id}`} key={group.id}>
-                <h2 style={shellStyles.groupLabel}>{group.label}</h2>
-                <div style={{ display: "grid", gap: "0.125rem" }}>
-                  {group.modules.map((entry) => (
-                    <ModuleButton
-                      entry={entry}
-                      key={moduleKey(entry)}
-                      onSelect={() => setSelectedKey(moduleKey(entry))}
-                      selected={moduleKey(entry) === selectedKey}
-                    />
-                  ))}
-                </div>
-              </section>
-            ))}
-            {ungrouped.length > 0 ? (
-              <section data-testid="group-ungrouped">
-                {groups.length > 0 ? <h2 style={shellStyles.groupLabel}>Other</h2> : undefined}
-                <div style={{ display: "grid", gap: "0.125rem" }}>
-                  {ungrouped.map((entry) => (
-                    <ModuleButton
-                      entry={entry}
-                      key={moduleKey(entry)}
-                      onSelect={() => setSelectedKey(moduleKey(entry))}
-                      selected={moduleKey(entry) === selectedKey}
-                    />
-                  ))}
-                </div>
-              </section>
-            ) : undefined}
-          </nav>
-        )}
+        <nav aria-label="Dashboard" style={{ display: "grid", gap: designToken("spacing.xl") }}>
+          <DashboardLink
+            current={route.kind === "overview"}
+            data-testid="select-overview"
+            history={history}
+            to={{ kind: "overview" }}
+          >
+            Overview
+          </DashboardLink>
+          {entries.length === 0 && groups.length === 0 ? (
+            <p data-testid="host-empty" style={{ color: designToken("text.secondary"), margin: 0 }}>
+              No installed module provides a user interface.
+            </p>
+          ) : undefined}
+          {groups.map((group) => (
+            <section data-testid={`group-${group.id}`} key={group.id}>
+              <h2 style={shellStyles.groupLabel}>{group.label}</h2>
+              <div style={{ display: "grid", gap: "0.125rem" }}>
+                {group.modules.map((entry) => (
+                  <ModuleLink
+                    entry={entry}
+                    history={history}
+                    key={moduleKey(entry)}
+                    route={route}
+                  />
+                ))}
+              </div>
+            </section>
+          ))}
+          {ungrouped.length > 0 ? (
+            <section data-testid="group-ungrouped">
+              {groups.length > 0 ? <h2 style={shellStyles.groupLabel}>Other</h2> : undefined}
+              <div style={{ display: "grid", gap: "0.125rem" }}>
+                {ungrouped.map((entry) => (
+                  <ModuleLink
+                    entry={entry}
+                    history={history}
+                    key={moduleKey(entry)}
+                    route={route}
+                  />
+                ))}
+              </div>
+            </section>
+          ) : undefined}
+        </nav>
       </aside>
-      <main style={shellStyles.main}>
-        {selected ? (
-          <ModuleUiFrame
-            config={config}
-            descriptor={selected.descriptor}
-            {...(importModule ? { importModule } : {})}
-            key={moduleKey(selected)}
-            onAuthorizationResponse={onAuthorizationResponse}
-            principal={bootstrap.principal}
-          />
-        ) : undefined}
+      <main aria-label={pageTitle} ref={mainRef} style={shellStyles.main} tabIndex={-1}>
+        {route.kind === "overview" ? (
+          <OverviewPage />
+        ) : route.kind === "module" ? (
+          openEntry ? (
+            <ModuleUiFrame
+              config={config}
+              descriptor={openEntry.descriptor}
+              {...(importModule ? { importModule } : {})}
+              key={moduleKey(openEntry)}
+              onAuthorizationResponse={onAuthorizationResponse}
+              principal={bootstrap.principal}
+            />
+          ) : (
+            <ModuleUnavailablePage history={history} />
+          )
+        ) : (
+          <NotFoundPage history={history} />
+        )}
       </main>
     </div>
   );

surfaces/shell/src/browser/HostPages.tsx

@@ -0,0 +1,66 @@
+import { EmptyState, PageHeader } from "@ekklesia/ui";
+import type { ReactElement } from "react";
+import { DashboardLink } from "./DashboardLink.js";
+import type { HostHistory } from "./host-history.js";
+
+/**
+ * The Dashboard's landing page (DESIGN.md §5, ADR 0057).
+ *
+ * The Overview is where the Dashboard opens. Its cards will come from modules through a contract
+ * that does not exist yet, so for now it honestly says it is empty rather than inventing content.
+ */
+export function OverviewPage(): ReactElement {
+  return (
+    <div data-testid="host-overview">
+      <PageHeader title="Overview" />
+      <EmptyState
+        description="Summaries from your modules will appear here as they become available. Choose a module in the navigation to open it."
+        title="Nothing to show yet"
+      />
+    </div>
+  );
+}
+
+/**
+ * A module page whose module is not available to this Dashboard: it was disabled or removed, it
+ * provides no user interface, or the address was mistyped. The server's navigation is the only
+ * authority on what exists, and it does not say which of these applies, so neither does this page.
+ * It never echoes the address back.
+ */
+export function ModuleUnavailablePage(props: { readonly history: HostHistory }): ReactElement {
+  return (
+    <div data-testid="host-module-unavailable">
+      <PageHeader
+        actions={<OverviewAction history={props.history} />}
+        description="The module it belongs to may have been turned off or removed. If you expected to see it, ask an administrator."
+        title="This page isn’t available"
+      />
+    </div>
+  );
+}
+
+/** Any other address inside the Dashboard. */
+export function NotFoundPage(props: { readonly history: HostHistory }): ReactElement {
+  return (
+    <div data-testid="host-not-found">
+      <PageHeader
+        actions={<OverviewAction history={props.history} />}
+        description="There is nothing at this address. Check it, or start again from the Overview."
+        title="Page not found"
+      />
+    </div>
+  );
+}
+
+function OverviewAction(props: { readonly history: HostHistory }): ReactElement {
+  return (
+    <DashboardLink
+      data-testid="host-go-to-overview"
+      history={props.history}
+      to={{ kind: "overview" }}
+      variant="action"
+    >
+      Go to Overview
+    </DashboardLink>
+  );
+}

surfaces/shell/src/browser/host-history.ts

@@ -0,0 +1,128 @@
+/**
+ * The shell's one view of the address bar (ADR 0057).
+ *
+ * The Dashboard's URL is the source of truth for which page is open: a refresh, a bookmark, and the
+ * browser's Back and Forward buttons all have to land on the same page that was showing. Everything
+ * in the shell reads the current path and moves between pages through this small interface rather
+ * than through `window.history`, for two reasons. It keeps the entry point the only file in this
+ * package that touches a browser global — the browser implementation is handed the window's pieces,
+ * it does not reach for them. And it lets every routing behaviour be tested against an in-memory
+ * history whose entries a test can inspect.
+ *
+ * Deliberately not a routing library. The shell's pages are a handful of host-owned screens plus one
+ * mounted module, and `react-router-dom` is refused to modules precisely because routing belongs to
+ * the host (ADR 0026); adopting it here would prejudge how a module's own pages are addressed, which
+ * a later decision owns.
+ */
+export interface HostHistory {
+  /** The current path, without query or fragment. */
+  pathname(): string;
+  /** Opens a new page, adding a history entry. Opening the page already showing adds none. */
+  push(path: string): void;
+  /** Corrects the current entry in place, adding none — for a non-canonical spelling of the same
+   * page. */
+  replace(path: string): void;
+  /** Notifies after every change, whether made here or by the browser's Back and Forward. */
+  subscribe(listener: () => void): () => void;
+}
+
+/** The parts of a `Window` the browser history needs, passed in by the entry point. */
+export interface HostHistoryWindow {
+  readonly location: Pick<Location, "pathname">;
+  readonly history: Pick<History, "pushState" | "replaceState">;
+  addEventListener(type: "popstate", listener: () => void): void;
+  removeEventListener(type: "popstate", listener: () => void): void;
+}
+
+/**
+ * The address bar itself. `pushState` and `replaceState` fire no event of their own, so this
+ * notifies its subscribers after each one; `popstate` covers Back and Forward.
+ */
+export function createBrowserHostHistory(view: HostHistoryWindow): HostHistory {
+  const listeners = new Set<() => void>();
+  const notify = (): void => {
+    for (const listener of [...listeners]) {
+      listener();
+    }
+  };
+  return {
+    pathname: () => view.location.pathname,
+    push(path) {
+      if (path === view.location.pathname) {
+        return;
+      }
+      view.history.pushState(null, "", path);
+      notify();
+    },
+    replace(path) {
+      view.history.replaceState(null, "", path);
+      notify();
+    },
+    subscribe(listener) {
+      if (listeners.size === 0) {
+        view.addEventListener("popstate", notify);
+      }
+      listeners.add(listener);
+      return () => {
+        listeners.delete(listener);
+        if (listeners.size === 0) {
+          view.removeEventListener("popstate", notify);
+        }
+      };
+    },
+  };
+}
+
+/** An in-memory history with the same semantics, whose entries a caller can inspect and step
+ * through. Used by tests; production always uses {@link createBrowserHostHistory}. */
+export interface MemoryHostHistory extends HostHistory {
+  readonly entries: readonly string[];
+  readonly index: number;
+  /** Steps like the browser's Back (`-1`) and Forward (`1`) buttons. */
+  go(delta: number): void;
+}
+
+export function createMemoryHostHistory(initialPath = "/"): MemoryHostHistory {
+  const entries: string[] = [initialPath];
+  let index = 0;
+  const listeners = new Set<() => void>();
+  const notify = (): void => {
+    for (const listener of [...listeners]) {
+      listener();
+    }
+  };
+  return {
+    get entries() {
+      return [...entries];
+    },
+    get index() {
+      return index;
+    },
+    pathname: () => entries[index] ?? "/",
+    push(path) {
+      if (path === entries[index]) {
+        return;
+      }
+      entries.splice(index + 1, entries.length, path);
+      index = entries.length - 1;
+      notify();
+    },
+    replace(path) {
+      entries[index] = path;
+      notify();
+    },
+    go(delta) {
+      const next = Math.min(Math.max(index + delta, 0), entries.length - 1);
+      if (next !== index) {
+        index = next;
+        notify();
+      }
+    },
+    subscribe(listener) {
+      listeners.add(listener);
+      return () => {
+        listeners.delete(listener);
+      };
+    },
+  };
+}

surfaces/shell/src/browser/main.tsx

@@ -4,6 +4,7 @@ import { createRoot } from "react-dom/client";
 import { consumeAuthLanding } from "../auth-protocol.js";
 import { type EkklesiaHostConfig, resolveApiOrigin } from "../host-protocol.js";
 import { HostApp } from "./HostApp.js";
+import { createBrowserHostHistory } from "./host-history.js";
 
 /**
  * The one place the shell touches a browser global.
@@ -23,6 +24,13 @@ const apiBaseUrl = resolveApiOrigin(
  * `consumeAuthLanding` for why the token must not stay in the URL. */
 const authLanding = consumeAuthLanding(window.location, window.history);
 
+/** The address bar, handed to the shell once so no other file reads `window.location` (ADR 0057). */
+const history = createBrowserHostHistory(window);
+
+const setDocumentTitle = (title: string): void => {
+  document.title = title;
+};
+
 const container = document.getElementById("ekklesia-host");
 if (!container) {
   throw new Error("The Ekklesia shell requires a #ekklesia-host element.");
@@ -53,9 +61,14 @@ function renderHost(config: EkklesiaHostConfig | undefined) {
     );
   }
   return authLanding ? (
-    <HostApp authLanding={authLanding} config={config} />
+    <HostApp
+      authLanding={authLanding}
+      config={config}
+      history={history}
+      setDocumentTitle={setDocumentTitle}
+    />
   ) : (
-    <HostApp config={config} />
+    <HostApp config={config} history={history} setDocumentTitle={setDocumentTitle} />
   );
 }
 

surfaces/shell/src/dashboard-routes.ts

@@ -0,0 +1,89 @@
+/**
+ * The Dashboard's URL space (ADR 0057): what each Dashboard path means.
+ *
+ * Framework-free and free of browser globals, because two programs read it. The shell parses the
+ * address bar with it, and `apps/api` serves the Dashboard page at the platform pages it lists, so a
+ * refreshed or bookmarked deep link reaches the shell instead of a `404`.
+ *
+ * Module pages and platform pages share one top-level namespace:
+ *
+ * ```text
+ * /                 Overview
+ * /settings[/…]     Settings
+ * /account[/…]      the account area
+ * /<module-id>[/…]  a module's page, and later its own sub-pages
+ * ```
+ *
+ * The server serves the page at `/<module-id>` only for a module that is actually installed with a
+ * Dashboard UI, and Core refuses any module whose id is a platform-owned name (`RESERVED_MODULE_IDS`
+ * in `@ekklesia/core/modules`), so a module page can never shadow a platform page and an arbitrary
+ * root path never becomes one.
+ */
+
+/**
+ * The Dashboard's own top-level pages besides the Overview. Reserved whole, including paths no page
+ * uses yet, so adding a Settings or Account page needs no server or proxy change. Each is also a
+ * reserved module id in Core; `apps/api` tests hold the two lists together.
+ */
+export const DASHBOARD_PLATFORM_PAGES = Object.freeze(["settings", "account"] as const);
+
+/** What a Dashboard path means. A path the shell does not understand is `not-found`, never a guess. */
+export type DashboardRoute =
+  | { readonly kind: "overview" }
+  | { readonly kind: "module"; readonly moduleId: string }
+  | { readonly kind: "not-found" };
+
+/** A route the shell can link to. `not-found` is something the shell arrives at, never a target. */
+export type DashboardDestination = Exclude<DashboardRoute, { readonly kind: "not-found" }>;
+
+const platformPages: ReadonlySet<string> = new Set(DASHBOARD_PLATFORM_PAGES);
+
+function decodeSegment(segment: string): string | undefined {
+  try {
+    const decoded = decodeURIComponent(segment);
+    return decoded.length > 0 ? decoded : undefined;
+  } catch {
+    return undefined;
+  }
+}
+
+/**
+ * Reads a path into a route.
+ *
+ * A single top-level segment that is not a platform page names a module's page. The id is only
+ * decoded here, never validated against a pattern: the shell compares it with the navigation the
+ * server resolved, and an id that matches no entry is an unavailable module, not a malformed URL.
+ *
+ * Everything below `/<module-id>/` belongs to that module's own pages (`/signage/timelines`), which
+ * need a contract that does not exist yet, so it is `not-found` for now rather than silently showing
+ * the module's first page. Settings and Account pages are likewise `not-found` until they exist. One
+ * trailing slash is tolerated, as a person typing a URL expects; the shell then replaces it with the
+ * canonical spelling.
+ */
+export function parseDashboardPath(pathname: string): DashboardRoute {
+  if (pathname === "/") {
+    return { kind: "overview" };
+  }
+  const segments = pathname.split("/");
+  if (segments[0] !== "") {
+    return { kind: "not-found" };
+  }
+  const meaningful = segments.at(-1) === "" ? segments.slice(1, -1) : segments.slice(1);
+  const first = meaningful[0] === undefined ? undefined : decodeSegment(meaningful[0]);
+  if (first === undefined || platformPages.has(first)) {
+    return { kind: "not-found" };
+  }
+  if (meaningful.length === 1) {
+    return { kind: "module", moduleId: first };
+  }
+  return { kind: "not-found" };
+}
+
+/** The one canonical spelling of a route. A module id is percent-encoded, so no id can escape its
+ * own path segment. */
+export function dashboardPath(route: DashboardDestination): string {
+  if (route.kind === "overview") {
+    return "/";
+  }
+  return `/${encodeURIComponent(route.moduleId)}`;
+}

surfaces/shell/tests/auth-recovery.test.tsx

@@ -3,6 +3,7 @@ import { createRoot, type Root } from "react-dom/client";
 import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
 import { consumeAuthLanding, type HostAuthLanding, readAuthLanding } from "../src/auth-protocol.js";
 import { HostApp } from "../src/browser/HostApp.js";
+import { createMemoryHostHistory } from "../src/browser/host-history.js";
 import type { EkklesiaHostConfig } from "../src/host-protocol.js";
 
 /**
@@ -94,7 +95,13 @@ function platform(stub: AuthStub = {}): Platform {
 
 async function render(config: EkklesiaHostConfig, authLanding?: HostAuthLanding): Promise<void> {
   await act(async () => {
-    root.render(<HostApp config={config} {...(authLanding ? { authLanding } : {})} />);
+    root.render(
+      <HostApp
+        config={config}
+        history={createMemoryHostHistory("/")}
+        {...(authLanding ? { authLanding } : {})}
+      />,
+    );
   });
 }
 

surfaces/shell/tests/dashboard-routes.test.ts

@@ -0,0 +1,94 @@
+// @vitest-environment node
+import { readFile } from "node:fs/promises";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+import { describe, expect, it } from "vitest";
+import {
+  DASHBOARD_PLATFORM_PAGES,
+  dashboardPath,
+  parseDashboardPath,
+} from "../src/dashboard-routes.js";
+
+const packageDirectory = path.dirname(path.dirname(fileURLToPath(import.meta.url)));
+
+describe("the Dashboard's own top-level pages", () => {
+  it("are exactly Settings and Account, frozen", () => {
+    expect(Object.isFrozen(DASHBOARD_PLATFORM_PAGES)).toBe(true);
+    expect(DASHBOARD_PLATFORM_PAGES).toEqual(["settings", "account"]);
+  });
+});
+
+describe("parseDashboardPath", () => {
+  it("makes the root the Overview", () => {
+    expect(parseDashboardPath("/")).toEqual({ kind: "overview" });
+  });
+
+  it("names a module page by its id at the top level, tolerating one trailing slash", () => {
+    expect(parseDashboardPath("/signage")).toEqual({ kind: "module", moduleId: "signage" });
+    expect(parseDashboardPath("/signage/")).toEqual({ kind: "module", moduleId: "signage" });
+    expect(parseDashboardPath("/people")).toEqual({ kind: "module", moduleId: "people" });
+  });
+
+  it("decodes a percent-encoded segment, so an id is compared as the server spells it", () => {
+    expect(parseDashboardPath("/sign%61ge")).toEqual({ kind: "module", moduleId: "signage" });
+  });
+
+  it("never reads a platform page as a module page", () => {
+    for (const pathname of ["/settings", "/settings/", "/account", "/account/appearance"]) {
+      expect(parseDashboardPath(pathname), pathname).toEqual({ kind: "not-found" });
+    }
+  });
+
+  it("treats every other shape as not found rather than guessing", () => {
+    for (const pathname of [
+      "",
+      "//",
+      "//signage",
+      "/signage//",
+      // A module's own sub-pages need a contract that does not exist yet (ADR 0057).
+      "/signage/timelines",
+      "/signage/timelines/abc",
+      "/%E0%A4%A",
+      "/settings/displays/add",
+      "signage",
+    ]) {
+      expect(parseDashboardPath(pathname), pathname).toEqual({ kind: "not-found" });
+    }
+  });
+});
+
+describe("dashboardPath", () => {
+  it("spells each route canonically, with no implementation prefix", () => {
+    expect(dashboardPath({ kind: "overview" })).toBe("/");
+    expect(dashboardPath({ kind: "module", moduleId: "signage" })).toBe("/signage");
+  });
+
+  it("encodes a module id so it can never escape its own segment", () => {
+    expect(dashboardPath({ kind: "module", moduleId: "a/../b" })).toBe("/a%2F..%2Fb");
+    expect(parseDashboardPath(dashboardPath({ kind: "module", moduleId: "a/../b" }))).toEqual({
+      kind: "module",
+      moduleId: "a/../b",
+    });
+  });
+
+  it("round-trips through the parser", () => {
+    for (const route of [
+      { kind: "overview" } as const,
+      { kind: "module", moduleId: "example" } as const,
+    ]) {
+      expect(parseDashboardPath(dashboardPath(route))).toEqual(route);
+    }
+  });
+});
+
+describe("the route locator is published for the API that serves the page", () => {
+  it("is a narrow package subpath, not the shell root barrel", async () => {
+    const manifest = JSON.parse(
+      await readFile(path.join(packageDirectory, "package.json"), "utf8"),
+    ) as { exports?: Record<string, unknown> };
+    expect(manifest.exports?.["./dashboard-routes"]).toEqual({
+      import: "./dist/dashboard-routes.js",
+      types: "./dist/dashboard-routes.d.ts",
+    });
+  });
+});

surfaces/shell/tests/display-app.test.tsx

@@ -3,6 +3,7 @@ import { act, Component, type ReactElement, type ReactNode } from "react";
 import { createRoot, type Root } from "react-dom/client";
 import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
 import { HostApp } from "../src/browser/HostApp.js";
+import { createMemoryHostHistory } from "../src/browser/host-history.js";
 import { DisplayApp } from "../src/display/DisplayApp.js";
 import type {
   EkklesiaHostConfig,
@@ -393,7 +394,15 @@ describe("display host — full-viewport boundary", () => {
       });
     };
 
-    await act(async () => root.render(<HostApp config={config} importModule={importer} />));
+    await act(async () =>
+      root.render(
+        <HostApp
+          config={config}
+          history={createMemoryHostHistory("/announcements")}
+          importModule={importer}
+        />,
+      ),
+    );
     // The management artifact rendered inside its own isolated root, not the shell's own tree.
     expect(isolatedText(container.querySelector('[data-testid="module-container"]'))).toContain(
       "announcement management",

surfaces/shell/tests/host-app.test.tsx

@@ -3,6 +3,7 @@ import { act } from "react";
 import { createRoot, type Root } from "react-dom/client";
 import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
 import { HostApp } from "../src/browser/HostApp.js";
+import { createBrowserHostHistory } from "../src/browser/host-history.js";
 import type { EkklesiaHostConfig } from "../src/host-protocol.js";
 import { isolatedMountTarget, isolatedText } from "./support/isolated-dom.js";
 
@@ -122,12 +123,27 @@ function artifact(id: string, version: string, options: ArtifactOptions = {}) {
   };
 }
 
+/**
+ * Renders the shell over the real (happy-dom) address bar. `path` opens that page first, exactly as
+ * a deep link or a refresh would (ADR 0057); left out, the shell opens wherever the location already
+ * is — `/`, the Overview, unless a test put something else there.
+ */
 async function render(
   config: EkklesiaHostConfig,
   importModule?: (url: string) => Promise<unknown>,
+  path?: string,
 ): Promise<void> {
+  if (path !== undefined) {
+    window.history.replaceState(null, "", path);
+  }
   await act(async () => {
-    root.render(<HostApp config={config} {...(importModule ? { importModule } : {})} />);
+    root.render(
+      <HostApp
+        config={config}
+        history={createBrowserHostHistory(window)}
+        {...(importModule ? { importModule } : {})}
+      />,
+    );
   });
 }
 
@@ -268,6 +284,11 @@ describe("Ekklesia shell — bootstrap", () => {
 });
 
 describe("Ekklesia shell — browser authentication", () => {
+  // These tests exercise a mounted module, so each opens the default fixture's own page, exactly as
+  // its deep link would (ADR 0057). The Dashboard root is the Overview and mounts nothing.
+  beforeEach(() => {
+    window.history.replaceState(null, "", "/example");
+  });
   it("renders only a neutral loading state until principal resolves and fetches no navigation early", async () => {
     let releasePrincipal: (() => void) | undefined;
     const principalPending = new Promise<void>((resolve) => {
@@ -539,6 +560,11 @@ describe("Ekklesia shell — browser authentication", () => {
 });
 
 describe("Ekklesia shell — logout and session expiration", () => {
+  // These tests exercise a mounted module, so each opens the default fixture's own page, exactly as
+  // its deep link would (ADR 0057). The Dashboard root is the Overview and mounts nothing.
+  beforeEach(() => {
+    window.history.replaceState(null, "", "/example");
+  });
   it("unmounts module UI and closes realtime before completing server-side logout", async () => {
     let releaseSignOut: (() => void) | undefined;
     const signOutPending = new Promise<void>((resolve) => {
@@ -856,10 +882,8 @@ describe("Ekklesia shell — Dashboard navigation", () => {
 
     const labels = [...container.querySelectorAll("h2")].map((heading) => heading.textContent);
     expect(labels).toEqual(["Planning", "Media"]);
-    const buttons = [...container.querySelectorAll("nav button")].map(
-      (button) => button.textContent,
-    );
-    expect(buttons).toEqual(["Calendar", "Livestream", "Video"]);
+    const links = [...container.querySelectorAll("nav section a")].map((link) => link.textContent);
+    expect(links).toEqual(["Calendar", "Livestream", "Video"]);
   });
 
   it("renders ungrouped modules alongside groups, under a heading", async () => {
@@ -897,14 +921,29 @@ describe("Ekklesia shell — Dashboard navigation", () => {
     expect(query("group-media")?.textContent).toBe("Media");
   });
 
-  it("selects the first module in the arranged order and marks it active", async () => {
+  it("opens on the Overview rather than choosing a module, whatever the arrangement", async () => {
+    const importModule = vi.fn(async () => artifact("video", "0.1.0"));
     await render(
       { apiBaseUrl, fetch: platformFetch({ groups: [mediaGroup(), planningGroup()] }) },
-      async (url) => artifact(url.includes("/video/") ? "video" : "other", "0.1.0"),
+      importModule,
     );
 
-    expect(query("select-video")?.getAttribute("aria-current")).toBe("page");
-    expect(query("select-livestream")?.getAttribute("aria-current")).toBeNull();
+    expect(query("select-overview")?.getAttribute("aria-current")).toBe("page");
+    expect(query("select-video")?.getAttribute("aria-current")).toBeNull();
+    expect(query("module-container")).toBeNull();
+    expect(importModule).not.toHaveBeenCalled();
+  });
+
+  it("marks the open module's link as the current page", async () => {
+    await render(
+      { apiBaseUrl, fetch: platformFetch({ groups: [mediaGroup(), planningGroup()] }) },
+      async () => artifact("livestream", "2.0.0"),
+      "/livestream",
+    );
+
+    expect(query("select-livestream")?.getAttribute("aria-current")).toBe("page");
+    expect(query("select-video")?.getAttribute("aria-current")).toBeNull();
+    expect(query("select-overview")?.getAttribute("aria-current")).toBeNull();
   });
 
   it("mounts a module selected from inside a group, using the descriptor the group carried", async () => {
@@ -915,6 +954,7 @@ describe("Ekklesia shell — Dashboard navigation", () => {
         requested.push(url);
         return artifact(url.includes("/calendar/") ? "calendar" : "video", "0.1.0");
       },
+      "/video",
     );
 
     await act(async () => {
@@ -972,6 +1012,11 @@ describe("Ekklesia shell — Dashboard navigation", () => {
 });
 
 describe("Ekklesia shell — mount lifecycle", () => {
+  // These tests exercise a mounted module, so each opens the default fixture's own page, exactly as
+  // its deep link would (ADR 0057). The Dashboard root is the Overview and mounts nothing.
+  beforeEach(() => {
+    window.history.replaceState(null, "", "/example");
+  });
   it("keeps fixed shell tracks while module content changes size", async () => {
     await render({ apiBaseUrl, fetch: platformFetch() }, async () => artifact("example", "0.1.0"));
 
@@ -1140,6 +1185,11 @@ describe("Ekklesia shell — mount lifecycle", () => {
 });
 
 describe("Ekklesia shell — failure is host-owned", () => {
+  // These tests exercise a mounted module, so each opens the default fixture's own page, exactly as
+  // its deep link would (ADR 0057). The Dashboard root is the Overview and mounts nothing.
+  beforeEach(() => {
+    window.history.replaceState(null, "", "/example");
+  });
   it("renders its own error when the artifact cannot be imported", async () => {
     await render({ apiBaseUrl, fetch: platformFetch() }, async () => {
       throw new Error("/srv/ekklesia/modules/example/dist/ui/index.js is missing");

surfaces/shell/tests/host-history.test.ts

@@ -0,0 +1,119 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { createBrowserHostHistory, createMemoryHostHistory } from "../src/browser/host-history.js";
+
+describe("the browser host history", () => {
+  beforeEach(() => {
+    window.history.replaceState(null, "", "/");
+  });
+
+  afterEach(() => {
+    window.history.replaceState(null, "", "/");
+  });
+
+  it("reads the address bar's path and moves it with real history entries", () => {
+    const history = createBrowserHostHistory(window);
+    const lengthBefore = window.history.length;
+
+    history.push("/example");
+
+    expect(history.pathname()).toBe("/example");
+    expect(window.location.pathname).toBe("/example");
+    expect(window.history.length).toBe(lengthBefore + 1);
+  });
+
+  it("adds no entry when the page asked for is already open", () => {
+    const history = createBrowserHostHistory(window);
+    history.push("/example");
+    const length = window.history.length;
+    const listener = vi.fn();
+    history.subscribe(listener);
+
+    history.push("/example");
+
+    expect(window.history.length).toBe(length);
+    expect(listener).not.toHaveBeenCalled();
+  });
+
+  it("corrects the current entry in place with replace", () => {
+    const history = createBrowserHostHistory(window);
+    history.push("/example/");
+    const length = window.history.length;
+
+    history.replace("/example");
+
+    expect(window.location.pathname).toBe("/example");
+    expect(window.history.length).toBe(length);
+  });
+
+  it("notifies after its own changes and after the browser's Back and Forward", () => {
+    const history = createBrowserHostHistory(window);
+    const listener = vi.fn();
+    const unsubscribe = history.subscribe(listener);
+
+    history.push("/a");
+    history.replace("/b");
+    window.dispatchEvent(new PopStateEvent("popstate"));
+    expect(listener).toHaveBeenCalledTimes(3);
+
+    unsubscribe();
+    window.dispatchEvent(new PopStateEvent("popstate"));
+    history.push("/c");
+    expect(listener).toHaveBeenCalledTimes(3);
+  });
+
+  it("listens to popstate only while something is subscribed", () => {
+    const view = {
+      addEventListener: vi.fn(),
+      history: { pushState: vi.fn(), replaceState: vi.fn() },
+      location: { pathname: "/" },
+      removeEventListener: vi.fn(),
+    };
+    const history = createBrowserHostHistory(view);
+
+    const first = history.subscribe(() => undefined);
+    const second = history.subscribe(() => undefined);
+    expect(view.addEventListener).toHaveBeenCalledTimes(1);
+
+    first();
+    expect(view.removeEventListener).not.toHaveBeenCalled();
+    second();
+    expect(view.removeEventListener).toHaveBeenCalledTimes(1);
+    expect(view.removeEventListener.mock.calls[0]?.[1]).toBe(
+      view.addEventListener.mock.calls[0]?.[1],
+    );
+  });
+
+  it("stores no state object, so nothing a page put in history can be read back as authority", () => {
+    const view = {
+      addEventListener: vi.fn(),
+      history: { pushState: vi.fn(), replaceState: vi.fn() },
+      location: { pathname: "/" },
+      removeEventListener: vi.fn(),
+    };
+    const history = createBrowserHostHistory(view);
+
+    history.push("/a");
+    history.replace("/b");
+
+    expect(view.history.pushState).toHaveBeenCalledWith(null, "", "/a");
+    expect(view.history.replaceState).toHaveBeenCalledWith(null, "", "/b");
+  });
+});
+
+describe("the in-memory host history", () => {
+  it("behaves like the browser's: push truncates forward entries, go steps within bounds", () => {
+    const history = createMemoryHostHistory("/");
+    history.push("/a");
+    history.push("/b");
+    history.go(-1);
+    expect(history.pathname()).toBe("/a");
+
+    history.push("/c");
+    expect(history.entries).toEqual(["/", "/a", "/c"]);
+
+    history.go(-10);
+    expect(history.pathname()).toBe("/");
+    history.go(10);
+    expect(history.pathname()).toBe("/c");
+  });
+});

surfaces/shell/tests/host-routing.test.tsx

@@ -0,0 +1,360 @@
+import { MODULE_UI_ABI_VERSION, type ModuleUiHostContext } from "@ekklesia/module-ui-sdk";
+import { act } from "react";
+import { createRoot, type Root } from "react-dom/client";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { HostApp } from "../src/browser/HostApp.js";
+import { createMemoryHostHistory, type MemoryHostHistory } from "../src/browser/host-history.js";
+import type { EkklesiaHostConfig } from "../src/host-protocol.js";
+import { isolatedText } from "./support/isolated-dom.js";
+
+declare global {
+  // eslint-disable-next-line no-var
+  var IS_REACT_ACT_ENVIRONMENT: boolean | undefined;
+}
+
+/**
+ * The Dashboard's URL is the source of truth for which page is open (ADR 0057). Every test drives
+ * the real shell through an in-memory history, so it can assert on the exact entries a person's
+ * Back and Forward buttons would walk.
+ */
+
+const apiBaseUrl = "https://ekklesia.example.test";
+
+let container: HTMLDivElement;
+let root: Root;
+let consoleError: ReturnType<typeof vi.spyOn>;
+
+beforeEach(() => {
+  globalThis.IS_REACT_ACT_ENVIRONMENT = true;
+  container = document.createElement("div");
+  document.body.append(container);
+  root = createRoot(container);
+  consoleError = vi.spyOn(console, "error").mockImplementation(() => undefined);
+});
+
+afterEach(async () => {
+  await act(async () => {
+    root.unmount();
+  });
+  container.remove();
+  consoleError.mockRestore();
+});
+
+function entry(id: string, name: string, version = "0.1.0") {
+  return {
+    module: {
+      api: { baseUrl: `/api/v1/modules/${id}` },
+      contributions: [],
+      display: null,
+      id,
+      permissions: [],
+      realtime: { baseUrl: `/api/v1/module-realtime/${id}` },
+      ui: { url: `/api/v1/module-ui/${id}/${version}` },
+      version,
+    },
+    name,
+  };
+}
+
+const NAVIGATION = {
+  groups: [{ id: "media", label: "Media", modules: [entry("signage", "Signage")], order: 10 }],
+  ungrouped: [entry("calendar", "Calendar", "2.0.0")],
+};
+
+function platform(options: { authenticated?: boolean } = {}) {
+  let authenticated = options.authenticated ?? true;
+  const fetchImplementation = vi.fn(async (input: RequestInfo | URL, init?: RequestInit) => {
+    const url = String(input);
+    if (url.endsWith("/api/auth/sign-in/email")) {
+      void init;
+      authenticated = true;
+      return Response.json({ ok: true });
+    }
+    if (url.endsWith("/api/v1/principal")) {
+      return Response.json(
+        authenticated ? { kind: "authenticated", userId: "user-1" } : { kind: "anonymous" },
+      );
+    }
+    if (url.endsWith("/api/v1/dashboard/navigation")) {
+      return authenticated
+        ? Response.json(NAVIGATION)
+        : Response.json({ code: "AUTHORIZATION_DENIED" }, { status: 403 });
+    }
+    return Response.json({ code: "NOT_FOUND" }, { status: 404 });
+  }) as unknown as typeof fetch;
+  return fetchImplementation;
+}
+
+function artifactFor(url: string) {
+  const id = url.includes("/calendar/") ? "calendar" : "signage";
+  return {
+    default: {
+      abi: MODULE_UI_ABI_VERSION,
+      id,
+      mount(element: Element, context: ModuleUiHostContext) {
+        element.textContent = `${context.moduleId} mounted`;
+        return () => {
+          element.textContent = "";
+        };
+      },
+      version: id === "calendar" ? "2.0.0" : "0.1.0",
+    },
+  };
+}
+
+interface Rendered {
+  readonly history: MemoryHostHistory;
+  readonly imported: string[];
+  readonly titles: string[];
+}
+
+async function render(
+  path: string,
+  options: { authenticated?: boolean; history?: MemoryHostHistory } = {},
+): Promise<Rendered> {
+  const history = options.history ?? createMemoryHostHistory(path);
+  const imported: string[] = [];
+  const titles: string[] = [];
+  const config: EkklesiaHostConfig = { apiBaseUrl, fetch: platform(options) };
+  await act(async () => {
+    root.render(
+      <HostApp
+        config={config}
+        history={history}
+        importModule={async (url) => {
+          imported.push(url);
+          return artifactFor(url);
+        }}
+        setDocumentTitle={(title) => titles.push(title)}
+      />,
+    );
+  });
+  return { history, imported, titles };
+}
+
+function query(testId: string): HTMLElement | null {
+  return container.querySelector<HTMLElement>(`[data-testid="${testId}"]`);
+}
+
+async function click(element: Element | null, init: MouseEventInit = {}): Promise<MouseEvent> {
+  if (!element) {
+    throw new Error("missing element");
+  }
+  const event = new MouseEvent("click", { bubbles: true, button: 0, cancelable: true, ...init });
+  await act(async () => {
+    element.dispatchEvent(event);
+  });
+  return event;
+}
+
+async function go(history: MemoryHostHistory, delta: number): Promise<void> {
+  await act(async () => {
+    history.go(delta);
+  });
+}
+
+describe("the Dashboard opens on the page its URL names", () => {
+  it("lands on the Overview at the root, and mounts no module", async () => {
+    const { imported, titles } = await render("/");
+
+    expect(query("host-overview")).not.toBeNull();
+    expect(query("host-overview")?.querySelector("h1")?.textContent).toBe("Overview");
+    expect(query("module-container")).toBeNull();
+    expect(imported).toEqual([]);
+    expect(query("select-overview")?.getAttribute("aria-current")).toBe("page");
+    expect(titles.at(-1)).toBe("Overview");
+  });
+
+  it("opens a module's page directly from its deep link — what a refresh or a bookmark does", async () => {
+    const { imported, titles } = await render("/calendar");
+
+    expect(imported).toEqual([`${apiBaseUrl}/api/v1/module-ui/calendar/2.0.0`]);
+    expect(isolatedText(query("module-container"))).toBe("calendar mounted");
+    expect(query("select-calendar")?.getAttribute("aria-current")).toBe("page");
+    expect(query("select-overview")?.getAttribute("aria-current")).toBeNull();
+    expect(query("host-overview")).toBeNull();
+    expect(titles.at(-1)).toBe("Calendar");
+  });
+
+  it("opens a module from inside a group exactly as one outside it", async () => {
+    const { imported } = await render("/signage");
+
+    expect(imported).toEqual([`${apiBaseUrl}/api/v1/module-ui/signage/0.1.0`]);
+    expect(query("select-signage")?.getAttribute("aria-current")).toBe("page");
+  });
+
+  it("says a module page is unavailable when no navigable module has that id, and loads nothing", async () => {
+    const { imported, titles } = await render("/disabled-module");
+
+    expect(query("host-module-unavailable")).not.toBeNull();
+    expect(query("module-container")).toBeNull();
+    expect(imported).toEqual([]);
+    // The address is never echoed back into the page.
+    expect(container.textContent).not.toContain("disabled-module");
+    expect(titles.at(-1)).toBe("This page isn’t available");
+    expect(query("host-go-to-overview")?.getAttribute("href")).toBe("/");
+  });
+
+  it("shows a host-owned not-found page for an address inside the Dashboard it does not know", async () => {
+    for (const path of ["/settings/displays", "/calendar/events", "/account"]) {
+      await act(async () => {
+        root.unmount();
+      });
+      root = createRoot(container);
+      const { imported, titles } = await render(path);
+
+      expect(query("host-not-found"), path).not.toBeNull();
+      expect(imported, path).toEqual([]);
+      expect(titles.at(-1), path).toBe("Page not found");
+      // Nothing in the navigation claims to be the open page.
+      expect(container.querySelector('[aria-current="page"]'), path).toBeNull();
+    }
+  });
+
+  it("addresses module pages at the top level, beside the platform's own pages, and never confuses the two", async () => {
+    // Core refuses a module whose id is a platform page, but even a navigation that somehow listed
+    // one could not turn `/settings` into a module page.
+    const { imported } = await render("/settings");
+
+    expect(query("host-not-found")).not.toBeNull();
+    expect(imported).toEqual([]);
+    expect(query("select-signage")?.getAttribute("href")).toBe("/signage");
+    expect(container.innerHTML).not.toContain("/modules/");
+  });
+
+  it("corrects a trailing slash to the canonical address in place, adding no history entry", async () => {
+    const { history, imported } = await render("/calendar/");
+
+    expect(history.entries).toEqual(["/calendar"]);
+    expect(imported).toHaveLength(1);
+  });
+
+  it("opens the deep link it was given once the person signs in, with no redirect", async () => {
+    const history = createMemoryHostHistory("/calendar");
+    const { imported } = await render("/calendar", { authenticated: false, history });
+    expect(query("host-login")).not.toBeNull();
+
+    const email = query("login-email") as HTMLInputElement;
+    const password = query("login-password") as HTMLInputElement;
+    const setter = Object.getOwnPropertyDescriptor(HTMLInputElement.prototype, "value")?.set;
+    await act(async () => {
+      setter?.call(email, "[email protected]");
+      email.dispatchEvent(new Event("input", { bubbles: true }));
+      setter?.call(password, "correct password");
+      password.dispatchEvent(new Event("input", { bubbles: true }));
+    });
+    await act(async () => {
+      query("host-login")
+        ?.querySelector("form")
+        ?.dispatchEvent(new Event("submit", { bubbles: true, cancelable: true }));
+    });
+
+    expect(isolatedText(query("module-container"))).toBe("calendar mounted");
+    expect(imported).toEqual([`${apiBaseUrl}/api/v1/module-ui/calendar/2.0.0`]);
+    expect(history.entries).toEqual(["/calendar"]);
+  });
+});
+
+describe("moving between pages", () => {
+  it("renders navigation as real links to canonical addresses", async () => {
+    await render("/");
+
+    for (const [testId, href] of [
+      ["select-overview", "/"],
+      ["select-signage", "/signage"],
+      ["select-calendar", "/calendar"],
+    ] as const) {
+      const link = query(testId);
+      expect(link?.tagName, testId).toBe("A");
+      expect(link?.getAttribute("href"), testId).toBe(href);
+    }
+    expect(container.querySelector('nav[aria-label="Dashboard"]')).not.toBeNull();
+  });
+
+  it("opens a page in place on an ordinary click, adding one history entry", async () => {
+    const { history, imported } = await render("/");
+
+    const event = await click(query("select-calendar"));
+
+    expect(event.defaultPrevented).toBe(true);
+    expect(history.entries).toEqual(["/", "/calendar"]);
+    expect(imported).toEqual([`${apiBaseUrl}/api/v1/module-ui/calendar/2.0.0`]);
+    expect(isolatedText(query("module-container"))).toBe("calendar mounted");
+  });
+
+  it("leaves a modified or middle click to the browser, so a page can open in a new tab", async () => {
+    const { history } = await render("/");
+
+    for (const init of [
+      { ctrlKey: true },
+      { metaKey: true },
+      { shiftKey: true },
+      { altKey: true },
+      { button: 1 },
+    ]) {
+      const event = await click(query("select-calendar"), init);
+      expect(event.defaultPrevented, JSON.stringify(init)).toBe(false);
+    }
+    expect(history.entries).toEqual(["/"]);
+  });
+
+  it("adds no entry when the open page's own link is clicked again", async () => {
+    const { history } = await render("/calendar");
+
+    await click(query("select-calendar"));
+
+    expect(history.entries).toEqual(["/calendar"]);
+  });
+
+  it("walks Back and Forward through exactly the pages that were open", async () => {
+    const { history, imported } = await render("/");
+    await click(query("select-signage"));
+    await click(query("select-calendar"));
+
+    await go(history, -1);
+    expect(isolatedText(query("module-container"))).toBe("signage mounted");
+    expect(query("select-signage")?.getAttribute("aria-current")).toBe("page");
+
+    await go(history, -1);
+    expect(query("host-overview")).not.toBeNull();
+    expect(query("module-container")).toBeNull();
+
+    await go(history, 1);
+    expect(isolatedText(query("module-container"))).toBe("signage mounted");
+    expect(imported).toEqual([
+      `${apiBaseUrl}/api/v1/module-ui/signage/0.1.0`,
+      `${apiBaseUrl}/api/v1/module-ui/calendar/2.0.0`,
+      `${apiBaseUrl}/api/v1/module-ui/signage/0.1.0`,
+      `${apiBaseUrl}/api/v1/module-ui/signage/0.1.0`,
+    ]);
+  });
+
+  it("returns to the Overview from an unavailable page through its own link", async () => {
+    const { history } = await render("/missing");
+
+    await click(query("host-go-to-overview"));
+
+    expect(history.entries).toEqual(["/missing", "/"]);
+    expect(query("host-overview")).not.toBeNull();
+  });
+
+  it("moves focus to the new page's content after a page change, but not on first load", async () => {
+    await render("/");
+    const main = container.querySelector("main");
+    expect(main?.getAttribute("tabindex")).toBe("-1");
+    expect(document.activeElement).not.toBe(main);
+
+    await click(query("select-calendar"));
+
+    expect(document.activeElement).toBe(main);
+    expect(main?.getAttribute("aria-label")).toBe("Calendar");
+  });
+
+  it("names the browser tab after each page as it opens", async () => {
+    const { titles } = await render("/");
+    await click(query("select-signage"));
+    await click(query("select-overview"));
+
+    expect(titles).toEqual(["Overview", "Signage", "Overview"]);
+  });
+});

surfaces/shell/tsconfig.build.json

@@ -11,6 +11,7 @@
   "include": [
     "src/index.ts",
     "src/dashboard-assets.ts",
+    "src/dashboard-routes.ts",
     "src/display-assets.ts",
     "src/host-protocol.ts",
     "src/module-context.ts"

tests/deploy.test.ts

@@ -189,6 +189,12 @@ describe("reference deployment compose files", () => {
       .join("\n");
 
     expect(directives).toContain("@ekklesia path / /api/* /display/* /assets/*");
+    // The Dashboard's other pages (ADR 0057): every top-level name shaped like a module id, and
+    // nothing else, so the API — which knows the installed modules — decides page or 404.
+    expect(directives).toContain(
+      `@dashboardPage path_regexp dashboardPage ${DASHBOARD_PAGE_PATTERN}`,
+    );
+    expect(directives).toMatch(/handle @dashboardPage \{\s*reverse_proxy api:3000 \{/u);
     expect(directives).toContain("header_up X-Forwarded-For {client_ip}");
     expect(directives).toContain("header_up -CF-Connecting-IP");
     expect(directives).toContain("trusted_proxies static {$EKKLESIA_TUNNEL_ADDRESS}/32");
@@ -200,6 +206,64 @@ describe("reference deployment compose files", () => {
   });
 });
 
+/** The proxies' Dashboard-page matcher: a module id's grammar (`@ekklesia/contracts`) as the first
+ * segment, then anything. Checked against real paths below so the regular expression itself is
+ * tested, not just its spelling. */
+const DASHBOARD_PAGE_PATTERN = "^/[a-z][a-z0-9]*(?:-[a-z0-9]+)*(?:/.*)?$";
+
+describe("the proxies' Dashboard-page matcher", () => {
+  const matcher = new RegExp(DASHBOARD_PAGE_PATTERN, "u");
+
+  it("forwards every Dashboard page and module-shaped name", () => {
+    for (const path of [
+      "/settings",
+      "/settings/displays/add",
+      "/account",
+      "/signage",
+      "/signage/",
+      "/signage/timelines",
+      "/sunday-production",
+      "/definitely-not-a-real-module",
+    ]) {
+      expect(matcher.test(path), path).toBe(true);
+    }
+  });
+
+  it("forwards nothing that could not be a module id", () => {
+    for (const path of [
+      "/",
+      "/favicon.ico",
+      "/robots.txt",
+      "/.well-known/x",
+      "/Signage",
+      "/-x",
+      "/1x",
+      "//signage",
+      "/a--b",
+    ]) {
+      expect(matcher.test(path), path).toBe(false);
+    }
+  });
+});
+
+describe("split-origin reference proxy", () => {
+  it("serves the Dashboard's page, its deep links, and its script on the Dashboard hostname, and no API", async () => {
+    const caddyfile = await text("Caddyfile.split.example");
+    const directives = caddyfile
+      .split("\n")
+      .filter((line) => !line.trim().startsWith("#"))
+      .join("\n");
+
+    expect(directives).toContain("@dashboard path / /assets/ekklesia-dashboard/*");
+    expect(directives).toContain(`path_regexp dashboardPage ${DASHBOARD_PAGE_PATTERN}`);
+    // The API's own namespaces stay refused on the Dashboard hostname even though they are shaped
+    // like a module id.
+    expect(directives).toContain("not path /api /api/* /display /display/* /assets /assets/*");
+    // The API hostname still serves no Dashboard page at all.
+    expect(directives).toContain("@api path /api/* /display/* /assets/ekklesia-display/*");
+  });
+});
+
 describe("reference deployment env examples", () => {
   it("contain no secret values", async () => {
     const secretKeys = new Map([