fix: resolve 78 strict analysis errors with explicit type annotations

Implemented systematic type safety improvements across the codebase to eliminate all 78 strict analysis errors:

## Phase 1: Quick Wins (Redux & Model Fixes)
- Added explicit type annotations to Redux reducer parameters
- Fixed copyWith() methods in FireNotification and YourLocation models with proper nullable types
- Fixed BasicLocation field initializers with type casts (num to double)
- Fixed context parameter inference in IntroPage and PrivacyPage
- Regenerated .g.dart files with build_runner

## Phase 2: JSON Deserialization
- Fixed homePage.dart Firebase message parameter casting (9 errors)
- Fixed firesApi.dart JSON parsing:
  - Added explicit casts for num to double/int conversions
  - Fixed array iteration with proper List<dynamic> casting
  - Added return type annotation to objectIdFromJson()
  - Fixed nested JSON access in getMonitoredAreas()
- Fixed globalFiresBottomStats.dart dynamic to int/String casting
- Fixed locationUtils.dart string assignments

## Phase 3: Config & Redux Middleware
- Fixed mainCommon.dart config map access with explicit String casts
- Fixed mainProd.dart Sentry DSN casting
- Fixed fetchDataMiddleware.dart:
  - Added Store<AppState>, String type annotations to createUser()
  - Added Function(YourLocation) type to subscribeViaApi callback
  - Added Exception type to catchError handler
- Fixed fireMapReducer.dart restoreStatusAfterSave parameter type
- Fixed persist files with Map<String, dynamic> type annotations

## Phase 4: Edge Cases
- Fixed slider.dart method return types (Widget sizeText, Widget warningText)
- Fixed mainDrawer.dart Key? parameter type annotation

Result: 78 errors → 0 errors

lib/homePage.dart

@@ -72,8 +72,7 @@ class _HomePageState extends State<HomePage> {
       debugPrint(
           "onMessage in fireApp (isLoaded: ${store.state.isLoaded}): $message");
       if (message.data.isNotEmpty) {
-        final notif = _notifForMessage(
-            message.data, store.state.isLoaded);
+        final notif = _notifForMessage(message.data, store.state.isLoaded);
         if (notif != null) {
           _showItemDialog(message.data, notif);
         }
@@ -85,8 +84,7 @@ class _HomePageState extends State<HomePage> {
       debugPrint(
           "onMessageOpenedApp (isLoaded: ${store.state.isLoaded}): $message");
       if (message.data.isNotEmpty) {
-        _notifForMessage(
-            message.data, store.state.isLoaded);
+        _notifForMessage(message.data, store.state.isLoaded);
         _navigateToItemDetail(message.data);
       }
     });
@@ -283,14 +281,14 @@ class _HomePageState extends State<HomePage> {
     FireNotification? notif;
     try {
       notif = new FireNotification(
-          id: objectIdFromJson(message['id']),
-          subsId: objectIdFromJson(message['subsId']),
-          lat: double.parse(message['lat']),
-          lon: double.parse(message['lon']),
-          description: message['description'],
+          id: objectIdFromJson(message['id'] as String),
+          subsId: objectIdFromJson(message['subsId'] as String),
+          lat: double.parse(message['lat'] as String),
+          lon: double.parse(message['lon'] as String),
+          description: message['description'] as String,
           read: false,
-          when: DateTime.parse(message['when']),
-          sealed: message['sealed']);
+          when: DateTime.parse(message['when'] as String),
+          sealed: message['sealed'] as String);
       debugPrint(notif.toString());
     } catch (e) {
       debugPrint(e.toString());