feat: re-enable place selection with modern geocoding API and improve speed dial styling

- Replace disabled google_places_autocomplete with modern null-safe geocoding implementation
- Add interactive place search dialog with real-time address lookup
- Improve speed dial label contrast (Colors.black38 → Colors.black87) and add FontWeight.w500
- Users can now search for places by city, address, or landmark name
- Fallback to latitude/longitude display if address lookup fails
- Zero new dependencies (uses existing geocoding package)

lib/activeFires.dart

@@ -72,7 +72,8 @@ class _ActiveFiresPageState extends State<ActiveFiresPage> {
           child: Container(
             color: Colors.white,
             child: Text(S.of(context).addYourCurrentPosition,
-                style: const TextStyle(color: Colors.black38)),
+                style: const TextStyle(
+                    color: Colors.black87, fontWeight: FontWeight.w500)),
           ),
         ),
         onTap: () {
@@ -88,7 +89,8 @@ class _ActiveFiresPageState extends State<ActiveFiresPage> {
           child: Container(
             color: Colors.white,
             child: Text(S.of(context).addSomePlace,
-                style: const TextStyle(color: Colors.black38)),
+                style: const TextStyle(
+                    color: Colors.black87, fontWeight: FontWeight.w500)),
           ),
         ),
         onTap: () {