Implements plan §14.6 Map Evolution with a dedicated /maps page for browsing all competitive maps. Users can now:
- Browse maps grouped by player count (2P, 3P, 4P, 6P)
- View map stats (engagement score, wall density, energy count, dimensions)
- Upvote/downvote maps directly from the browsing interface
- See net vote counts and their own vote state
The page integrates with existing map voting API and data structure from the index builder.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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