Surface recently-used commands in the Command Palette (⌘K)

[DragonnZhang]

Closes #56

What & why

OpenWork's command palette (⌘K / Ctrl+K, shipped in #42) lists every registered
action grouped by category but keeps no memory of what you run — you
re-search even for the command you ran seconds ago. Every mature palette (VS
Code ⌘⇧P, Raycast, Linear ⌘K, Claude Code Desktop's command menu) pins a
"Recently used" section to the top so your frequent actions are one
keystroke away. This adds it.

Changes

• Persisted recents (apps/electron/src/renderer/components/command-palette-recents.ts):
  a small module storing the most-recently-run action IDs in the renderer's
  localStorage (newest first, de-duplicated, capped at 6) via the shared
  lib/local-storage.ts helper (one new key, command-palette-recents). The
  ordering (pushRecent: dedupe → prepend → cap) is a pure function.
• Palette integration (CommandPalette.tsx): record each action run from
  the palette; render a "Recently used" CommandGroup above the categories
  only when the query is empty, and hide it while searching so cmdk's
  relevance filtering takes over. Recents are filtered to actions that still
  exist, aren't excluded, and can run right now (canExecute) — never a stale
  or dead row.
• i18n: one new key commands.recent added to all 7 locales.
• Tests: command-palette-recents.test.ts (pure pushRecent: dedupe,
  move-to-front, cap, immutability) + e2e/assertions/command-palette-recents.assert.ts.

Frontend-only — no qwen-code backend change, no new IPC, no main-process change.

Verification

• bun run typecheck:all — zero delta vs main (identical error hash/count;
  the 11 pre-existing apps/electron errors are unrelated to this change;
  packages/shared and packages/ui are clean).
• bun test — zero delta vs main (56 pre-existing baseline failures on
  both main and this branch, 0 new); the new pushRecent unit suite is
  6/6 pass.
• bun run electron:build:renderer — ✅ builds cleanly (the renderer bundle
  contains the palette change).
• CDP assertion could not run in this environment (same block as prior loop
  rounds): the sandbox's egress policy prevents fetching the Electron binary and
  the libsignal GitHub dependency (WhatsApp worker), so electron:build:main
  and app launch fail here. The assertion is written and self-contained for CI /
  reviewer validation.

What the CDP assertion checks (command-palette-recents.assert.ts)

Drives the real built app over CDP in the draft (no-session) state; the palette
reads recents fresh from localStorage on each open:

1. Seed localStorage['craft-command-palette-recents'] = ['app.toggleTheme'],
   open the palette → a "Recently used" group renders exactly one row
   (Toggle Theme), above the first category row.
2. Type sidebar → the recents group hides (0 recent rows) while filtering
   still surfaces a Toggle Sidebar match; clearing the query brings recents back.
3. Run a new, not-yet-recent action (Toggle Sidebar) from the palette, then
   reopen → the recents group now has two rows with Toggle Sidebar
   first, Toggle Theme second — proving the palette persists what you run
   and orders newest-first.

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