Add 12 major features: community detection, timeline, filters, analysis tools, groups, minimap, undo/redo, and more

Features added:
- Leiden-CPM community detection with adjustable resolution and convex hull overlays
- Timeline with met date on nodes/edges and playback slider
- Tag-based subgraph filtering
- Betweenness centrality ranking (bridge people identification)
- Island/disconnected component detection
- Community overlap analysis with Venn diagram
- Manual node grouping with visual hulls and context menu integration
- Notes/备注 field per person
- Multi-graph support (create/switch/delete independent networks)
- Undo/Redo (Ctrl+Z/Y) with 50-step history
- Command palette (Ctrl+F) for quick node search
- Minimap for navigation in large graphs
- Keyboard shortcuts (Ctrl+N, ?, Delete, Escape)

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

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