Restore Paper command palette focus on close

[Chris0Jeky]

Closing the Paper command palette could leave keyboard focus on the document body, including after a desktop card inspector became a mobile modal. Restore a connected opener, preserve deliberate destination focus, cancel stale close callbacks after a quick reopen, and fall back inside the active modal when the opener disappeared.

Refs #2090 (the recorded #2799 shell-focus follow-up). Legacy ShellCommandPalette remains frozen under D-3; the broader board-controls issue remains open.

Validation at ea91e8c:

• Red-first focused unit run: 12 passed / 2 failed; repaired suite 14/14.
• Chromium regression: 1/1, inspector -> palette -> 390px modal -> Escape -> focus inside modal. Worktree-local Mock stack, API 58741/frontend 5179; both owned servers stopped.
• Full frontend: 391 files, 6,222 passed, 3 skipped.
• Typecheck, production build, scoped ESLint and diff check passed.
• Fresh-context Terra high review: SHIP; no findings.
• Hosted CI pending; other browsers not exercised for this new journey.

Docs: shipped-state reconciliation follows merge. Canonical STATUS/MASTERPLAN/TESTING_GUIDE remain leased by the separate existing-PR closeout lane. No card-write or approval behavior changes.

[Chris0Jeky]

Independent review: Terra high reviewed ea91e8c against 7ac99a7. SHIP, no CRITICAL/HIGH or lower findings. Reviewed opener restoration, detached-opener modal fallback, explicit destination focus, quick reopen lifecycle guards, and regression quality. Round 1 complete; no source changes requested.

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-09T10:10:56.785237Z	ea91e8c	PR opened

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[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: ea91e8cd0d

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[Chris0Jeky]

Open-PR closeout coordinator: I am reconciling this new ready candidate into the current commit-preserving integration PR #2815, alongside the earlier ten reviewed heads. Please hold this source head and do not merge main independently while final combined qualification is running. I retain canonical docs, final interaction review and merge ownership; your source review/evidence remains scoped and preserved.

[Chris0Jeky]

[Codex lane release v2]
#2817 merged with commit 64508d3 after exact-head required CI, Terra high review, comment triage and push aging passed. Implemented Paper palette opener/modal focus restoration and verified the real inspector-to-mobile-modal browser sequence. Remaining MEDIUM tabindex=-1 opener case is tracked in comment5600180405; #2090 stays open for its remaining scope.

Owned worktree removed without force after clean status and ignored-file inventory. Synthetic SQLite fixtures (including sidecars) and Playwright test-results were preserved locally at C:\Users\jekyt\source\Taskdeck.claude\local\milestone-20260909\preserved-2817. Rebuildable bin/obj/dist/node_modules were discarded. No other worktrees or original checkout changes were removed.