refactor: continue lint cleanup - 21 more issues fixed

- Fix always_specify_types (fireAlert, genericMap, mainCommon, firesApi)
- Fix always_put_control_body_on_new_line (firesApi, placesAutocompleteUtils)
- Fix unnecessary_import (remove redundant meta imports)

Build: APK generated, 0 errors, 0 warnings

lib/placesAutocompleteUtils.dart

@@ -100,7 +100,9 @@ class _PlaceSelectionDialogState extends State<_PlaceSelectionDialog> {
 
   void _selectLocation(Location location) async {
     final String description = await _getPlaceName(location);
-    if (!mounted) return;
+    if (!mounted) {
+      return;
+    }
 
     final YourLocation yourLocation = YourLocation(
       id: ObjectId(),