feat(dashboard): implement command palette with fuzzy search and time navigation
Ctrl+K / Cmd+K universal search interface for expert mode with:
- Fuzzy matching (prefix, substring, word-level, subsequence)
- Time navigation via @ prefix (@3am, @yesterday 11pm, @this morning, @last night)
- 36 commands across navigation, view, system, security, appearance, actions, help
- Entity search across zones, people, nodes, events
- Recent history with localStorage persistence
- Expert-mode gating (disabled in simple/ambient modes)
- Keyboard navigation (arrow keys, Enter, Escape, Tab)
- Toolbar shortcut hint with platform-aware display (⌘K on Mac)
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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