Merge pull request #673: fix(mobile): keep the keyboard up when an accessory key is pressed

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

docs/architecture-invariants.md

@@ -1068,6 +1068,8 @@ Tests: `test/mobile-prompt-composer.test.ts` (in the CI gate, deliberately not u
 
 ⚠️ **A scroll ends in `touchend` too** — dismissing there closes the keyboard and drops the composer mid-read, so travel is tracked from `touchstart` and multi-touch is never a tap. Both classifiers MUST share one threshold: `initTerminal`'s `TAP_THRESHOLD` reads `MOBILE_KEYBOARD_DISMISS_TAP_SLOP`, since a gesture the terminal calls a scroll and the dismiss handler calls a tap is exactly that bug.
 
+⚠️ **An accessory key that keeps the keyboard up must not take focus on the press.** The keys that act on the terminal and leave the keyboard open (`ACCESSORY_REFOCUS_ACTIONS` in keyboard-accessory.js: scroll, arrows, Tab, Shift+Tab, Ctrl, Esc, clear input and the rest) cancel the `mousedown` default, the same pattern as the Attach input, so the hidden textarea keeps focus through the press; the `terminal.focus()` in the click handler stays as the fallback. Letting the tap blur the terminal and refocusing it afterwards made every such key start a keyboard dismissal, a blur/focus pair per tap that shifted the toolbar each time. A first tap on clear/compact only arms the confirm and is treated the same; the confirming tap, and keys that open a dialog or dismiss the keyboard on purpose, keep the default. Pinned against the real module by `test/accessory-keeps-terminal-focus.test.ts`.
+
 ⚠️ **The gate excludes `test/mobile/**`, so CI cannot see the only test covering (1)** — run `npm run test:mobile -- test/mobile/keyboard.test.ts` by hand and diff the FAIL list against master. (Not `npm test --`: the gate's config excludes that path, so a file filter pointing into it matches nothing and exits green having run zero tests.) That blind spot is why merging the two PRs, which conflicted semantically but not textually, produced a red suite with two green CI checks.
 
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