feat: initial Signage 0.1.0

vitest.config.ts

@@ -0,0 +1,15 @@
+import { defineConfig } from "vitest/config";
+
+/**
+ * Signage's own test configuration.
+ *
+ * It exists because this module's browser tests are `.tsx` — they mount real React — and the
+ * repository root's configuration includes only `.test.ts`. Without this file those tests are
+ * silently not run, which is the worst possible failure mode for a test suite.
+ */
+export default defineConfig({
+  test: {
+    include: ["tests/**/*.test.ts", "tests/**/*.test.tsx"],
+    passWithNoTests: false,
+  },
+});