- Add offline.stadia_key to OFFLINE_DEFAULTS in routes/offline.py
- Add stadia_dark and tactical tile providers to Settings.tileProviders
- Update getTileConfig() to inject Stadia API key or fall back to CartoDB dark
- Add setStadiaKey() method for saving and applying the API key
- Show/hide Stadia key row in setTileProvider() and _updateUI()
- Add Stadia options to tile provider select in settings modal
- Add Stadia API key input row to settings modal
- Add TDD tests for stadia_key backend
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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