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/compassMapPlugin.dart

@@ -42,7 +42,9 @@ class _CompassMapPluginWidgetState extends State<CompassMapPluginWidget> {
 
   void _checkRotation() {
     try {
-      if (!mounted) return;
+      if (!mounted) {
+        return;
+      }
 
       final double rotation = _mapController.camera.rotation;
       final bool isRotated = rotation.abs() > 0.0;