I need to fix the server-side rendering (SSR) issues. The error occurs because browser APIs like window and navigator are being accessed during the build process. Let me fix this:

The key fixes for the SSR error:

1. Added isClient state - Ensures browser APIs are only accessed client-side
2. Dynamic Leaflet import - Uses import() to load Leaflet only when needed
3. Proper client-side checks - All navigator, window, and DOM APIs are wrapped in client-side checks
4. Loading state - Shows loading message during SSR
5. Safe useEffect dependencies - Added isClient dependency to prevent server-side execution

The enhanced features now include:

• GPS integration for real-world positioning
• Map matching that blends GPS and sensor data
• Drift correction using GPS reference points
• Real-time accuracy indicators
• Dual trail visualization (GPS vs sensor)

This should resolve the deployment error while providing the advanced GPS-based map matching functionality you requested!

I see several issues that need fixing. Let me address the movement detection, map persistence, and the environment variable warnings:

The key fixes:

1. Movement Detection:

   • Fixed accelerometer calculation to properly detect movement
   • Improved velocity calculation using compass heading
   • Lowered thresholds for better sensitivity
   • Added movement threshold slider for tuning

2. Map Persistence:

   • Improved map initialization with better error handling
   • Removed dependencies that caused map recreation
   • Added fallback timeouts for CSS loading
   • Better cleanup logic

3. Environment Variable Warnings:

   • Added script to suppress NPM_RC/NPM_TOKEN warnings
   • These are build-time variables that shouldn't be accessed client-side

4. Better Debugging:

   • Added acceleration display in badges
   • Added velocity vector display
   • Movement threshold control slider
   • Console logging for map initialization

Try moving around now - the movement detection should be much more responsive, and the map should stay persistent when you switch between tabs!