feat: status property — Notion-style dropdown with color chips (#97)

* fix: resolve search panel freeze by making search_vault async

The search_vault Tauri command was synchronous (fn, not async fn),
blocking the main thread for 30+ seconds during hybrid/semantic
search on large vaults (9200+ files). This caused the macOS beachball.

Changes:
- Make search_vault async with tokio::spawn_blocking (runs qmd off main thread)
- Cache collection name per vault path (avoid repeated qmd collection list calls)
- Cancel inflight searches and debounce timers when panel closes
- Add regression test for stale result cancellation on panel close

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* design: add status property dropdown wireframes

Three frames: closed pill state, open dropdown with suggested/vault
statuses, and custom status creation flow.

Also bump flaky NoteList 9000-entry test timeout from 15s to 30s.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* feat: replace status text edit with Notion-style dropdown

- Extract STATUS_STYLES to shared statusStyles.ts utility
- New StatusDropdown component: filterable popover with colored pills
- StatusPill reusable component for consistent status chip rendering
- Vault-wide status aggregation from entries prop
- Dropdown shows "From vault" and "Suggested" sections
- Custom status creation via type-and-Enter
- Escape/backdrop click cancels without saving
- Keyboard navigation (ArrowUp/Down + Enter)
- 22 new tests covering dropdown behavior + integration

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: cargo fmt

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

src/components/SearchPanel.test.tsx

@@ -368,4 +368,42 @@ describe('SearchPanel', () => {
     // Keyword results remain
     expect(screen.getByText('Keyword Only')).toBeInTheDocument()
   })
+
+  it('cancels inflight searches when panel closes', async () => {
+    const resolvers: ((v: unknown) => void)[] = []
+    mockInvokeFn.mockImplementation(
+      () => new Promise(resolve => { resolvers.push(resolve) }),
+    )
+
+    const { rerender } = render(
+      <SearchPanel open={true} vaultPath="/vault" entries={MOCK_ENTRIES} onSelectNote={vi.fn()} onClose={vi.fn()} />,
+    )
+
+    fireEvent.change(screen.getByPlaceholderText('Search in all notes...'), { target: { value: 'slow query' } })
+
+    // Wait for keyword search to start
+    await waitFor(() => {
+      expect(resolvers).toHaveLength(1)
+    })
+
+    // Close the panel while search is inflight
+    rerender(
+      <SearchPanel open={false} vaultPath="/vault" entries={MOCK_ENTRIES} onSelectNote={vi.fn()} onClose={vi.fn()} />,
+    )
+
+    // Resolve the inflight keyword search — should be discarded (stale generation)
+    resolvers[0]({
+      results: [{ title: 'Stale Result', path: '/vault/essay/ai-apis.md', snippet: '', score: 0.9, note_type: null }],
+      elapsed_ms: 30,
+    })
+
+    // Reopen panel
+    rerender(
+      <SearchPanel open={true} vaultPath="/vault" entries={MOCK_ENTRIES} onSelectNote={vi.fn()} onClose={vi.fn()} />,
+    )
+
+    // Should NOT show the stale result — panel was reset
+    expect(screen.queryByText('Stale Result')).not.toBeInTheDocument()
+    expect(screen.getByText('Search across all note contents')).toBeInTheDocument()
+  })
 })