Add Codex parity pass for shortcuts, thread find, and focus guards

[friuns2]

Why

This PR completes a broad Codex desktop parity pass for keyboard-first workflows in the web app. The main objective is to make global shortcuts predictable, route-safe, and focus-safe while adding thread-scoped find behavior that matches expected desktop ergonomics.

What Changed

1) Thread-Scoped Find UX (new)

Implemented a dedicated Find in thread control set in the thread header actions area:

• text input (Find in thread)
• live match counter (current/total)
• previous/next navigation buttons
• clear button

Behavior added:

• query is matched against current thread messages
• active match is tracked and surfaced to conversation view
• Enter and Shift+Enter step through matches
• state resets appropriately on thread changes

Implementation wiring:

• App-level find state + computed match IDs/count
• active highlight target passed into conversation component

2) Global Shortcut Parity Expansion

Extended and normalized shortcut handling in app shell to align with Codex-style desktop flows, including fallback mappings where this fork lacks exact panel equivalents.

Covered areas include:

• navigation/history/thread-cycle shortcuts
• settings/skills/command-surface shortcuts
• new-thread/new-window/open-folder flows
• thread actions (review/pin/archive/rename)
• copy/deeplink/context-related shortcuts

3) Focus-Safety Guards (major hardening)

Added consistent safety guards so global shortcuts do not fire when user focus is in:

• editable controls (input, textarea, contenteditable, select-like/combobox/search/spinbutton surfaces)
• terminal-like focus hosts ([data-codex-terminal] and related probes)

Result:

• prevents accidental route jumps, panel toggles, and destructive thread actions while typing
• avoids hijacking terminal-style keyboard workflows

4) Composer Keyboard/Escape Parity

Refined composer key handling paths for parity and consistency:

• send/model/plan-mode-related shortcut behavior adjustments
• mention/attach menu escape semantics
• focus-preserving escape flows

5) Sidebar Thread Tree Integration

Added integration points for keyboard-driven thread actions from shell-level shortcuts:

• ref-based connection from app shell to thread tree actions
• improved rename/pin action invocation consistency

6) Account/Label/Formatting Parity Polish

Small but user-visible parity improvements:

• workspace ID label/title treatment
• compact weekly reset date formatting is locale-aware
• detached-branch display fallback normalization

7) Parity Knowledge Base Updates

Updated .agents/skills/codex-app-parity/SKILL.md with concrete findings from this implementation cycle:

• route/focus guard guidance
• shortcut fallback conventions
• terminal-focus verification hygiene

8) Manual Verification Coverage Expansion

tests.md now includes extensive feature-by-feature manual test sections with:

• prerequisites/setup
• exact interaction steps
• expected results
• rollback notes

Changed Files

• .agents/skills/codex-app-parity/SKILL.md
• .gitignore
• src/App.vue
• src/components/content/ThreadComposer.vue
• src/components/content/ThreadConversation.vue
• src/components/sidebar/SidebarThreadTree.vue
• src/composables/useDesktopState.ts
• tests.md

Verification Performed

• Iterative targeted Playwright parity assertion runs during implementation.
• Repeated shortcut smoke/report executions while expanding coverage.
• Manual/logic validation of focus-guard and route-scope conditions.

Notes:

• Some parity scripts are environment/seed-state sensitive (port/session/thread availability), so full-suite determinism may require clean server/session setup.

Risk Assessment

• Scope risk: Moderate (large keyboard surface touched).
• Primary mitigations:
  • strict route/thread gating for thread actions
  • comprehensive editable/terminal focus guards
  • expanded manual test matrix in tests.md

Backward Compatibility

• Existing UI architecture and dependency set preserved.
• No new runtime dependencies introduced.
• Behavior changes are focused on shortcut handling and find UX, with conservative fallbacks where exact desktop surfaces do not exist in this fork.

Follow-up Candidates (optional)

• Stabilize flaky parity scripts by standardizing test seed/setup helpers.
• Split parity smoke into deterministic tiers (core vs environment-dependent).
• Add lightweight unit coverage around shared shortcut guard predicates.