feat: implement location selection interface with EXIF, GPS, and map picker

- Created LocationSelector component with three location input methods:
  * Auto-populate from photo EXIF data
  * Device GPS location capture with accuracy indicator
  * Interactive Leaflet map picker with draggable marker
- Added Ireland coordinate validation (lat: 51.4-55.4, lng: -10.5--5.5)
- Created coordinate utility functions for validation and formatting
- Added LocationSelectorDemo page for testing at /demo/location-selector
- Displays selected location with coordinates, source, and accuracy
- Provides clear error messages for validation failures
- Satisfies requirements 1.1, 1.2, 1.3, 8.2

src/utils/index.ts

@@ -1,17 +1,7 @@
 // Utility functions for the Beach Litter Mapping Platform
 
-/**
- * Validates if coordinates are within Ireland's geographical bounds
- */
-export function isValidIrishCoordinates(lat: number, lng: number): boolean {
-  // Ireland approximate bounds
-  const MIN_LAT = 51.4;
-  const MAX_LAT = 55.4;
-  const MIN_LNG = -10.5;
-  const MAX_LNG = -5.5;
-
-  return lat >= MIN_LAT && lat <= MAX_LAT && lng >= MIN_LNG && lng <= MAX_LNG;
-}
+// Re-export coordinate utilities
+export * from './coordinates';
 
 /**
  * Formats a date to ISO 8601 format