- PATCH /api/users/:id route to update user permissions
- Auth session stores and returns allowedMuseums/allowedChannels
- User type gains AllowedMuseums/AllowedChannels (JSON string fields)
- parseAllowed() with fail-closed semantics (empty string → null → no data)
- Dashboard/Comparison apply permission base filter before user filters
- Filter dropdowns (museums, channels, years, districts) derived from
permission-filtered data — restricted users only see their allowed options
- Settings UserRow component with inline checkbox pickers for access config
- Access badges in users table showing current restriction summary
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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