docs: temporary workspace restore, the admin link bubble, and Sunday's checks

wonder-ink.md: where WonderInk keeps its sign-in (Basic auth in a cookie)
and why only tabs are restored; what comes back and what never does; what
counts as use; when it is not restored; the test-only override. And the
link bubble teachers saw: WonderInk's CKEditor 5 for Admin accounts,
where a plain click on a link is an editing click by design; Viewers get
one-click links, measured on the real Saul lesson, and Wonder Ink does
not override the editor.

The manual says closing still signs you out and recent tabs come back
for two hours. testing.md has the Little Waders checklist.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

docs/testing.md

@@ -575,14 +575,14 @@ ifupdown stanza is already gone. **Do not run `--adopt` on it.**
       still reports `yes`
 - [ ] The laptop still reconnects after a reboot
 
-## Wonder Ink — 0.2.6.1 to 0.2.6.3, before any goes to stable
+## Wonder Ink — 0.2.6.1 to 0.2.6.4, before any goes to stable
 
 Everything below was done in the lab except what a lab cannot do: paper,
 a classroom's own graphics, a real keyboard, its network and its screen.
 Those are these checks. Stable stays on 0.2.2 until they pass.
 
 Before starting, on each machine: `dpkg-query -W ekklesia-classroom`
-must say `0.2.6.3`, which carries everything 0.2.6.1 and 0.2.6.2 did. The desktops only get it once stable is moved, so on
+must say `0.2.6.4`, which carries everything 0.2.6.1 to 0.2.6.3 did. The desktops only get it once stable is moved, so on
 a desktop install it by hand for the test:
 
 ```
@@ -692,12 +692,41 @@ classroom-wonderink --diagnose
       with a driver named above points at the network
 - [ ] `free -m`: Wonder Ink needs about 610 MB plus 115 MB per extra tab
 
-### Signing out
+### Temporary workspace restore (0.2.6.4) — Little Waders
 
-- [ ] Sign in, close Wonder Ink, open it again → **signed out**. (Cookies
-      are session-only and measured so; the site's Local Storage is not
-      cleared, which is the one way this could fail and has never been
-      tested with a real account)
+Use a **Viewer** account. An Admin sees lessons in WonderInk's editor,
+where a click on a link shows its Edit/Unlink bubble — WonderInk's design,
+not Wonder Ink's; Ctrl+click opens it. See wonder-ink.md, *Links in a
+lesson*.
+
+1. [ ] Sign in to the real WonderInk site
+2. [ ] Open three lesson/resource tabs: the lesson, and two of its links —
+       for example *Saul Welcome Question Slide* and a video or worksheet
+3. [ ] Click the **middle** tab
+4. [ ] Close Wonder Ink (the × at the top right)
+5. [ ] Open it again straight away from the panel
+6. [ ] The WonderInk tab asks you to **sign in** — sign in normally (your
+       password is never kept, so it always will)
+7. [ ] The **recent tabs are back**: the slide and the other resource
+8. [ ] **In the same order** as before
+9. [ ] With the **middle tab in front**
+10. [ ] Open a worksheet from a lesson, then close and reopen Wonder Ink:
+        the worksheet tab comes back, named after the file
+11. [ ] Print from a restored tab (the slide or the worksheet) through
+        Elmer: **the paper matches the preview**
+12. [ ] Links still open with one click in a new tab, as before (Viewer)
+13. [ ] With the tabs open, **reboot** the computer; within two hours of
+        using Wonder Ink, open it again
+14. [ ] **The recent tabs are back** (after signing in on the WonderInk tab)
+15. [ ] **Expiry, without waiting two hours.** Close Wonder Ink. Open the
+        maintenance terminal (Meta+Ctrl+Alt+Shift+K) and run
+        `CLASSROOM_WONDERINK_TEST_WORKSPACE_SECONDS=120 classroom-wonderink`.
+        This is **test-only**: it lasts as long as that one Wonder Ink,
+        can only shorten the time, and nothing in the classroom sets it
+16. [ ] Open a couple of tabs in it, click in one, then touch nothing for
+        **three minutes** and close it
+17. [ ] Open Wonder Ink from the panel: it **starts fresh**, one tab on the
+        WonderInk start page, none of the old tabs
 
 ### Presentations under memory pressure (0.2.6.2, the laptop)