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/models/firesApi.dart

@@ -22,7 +22,6 @@ class FiresApi {
 
   Future<String> createUser(
       AppState state, String mobileToken, String lang) async {
-
     final params = {
       "token": state.firesApiKey,
       "mobileToken": mobileToken,
@@ -32,7 +31,7 @@ class FiresApi {
     try {
       final response = await _dio.post(url, data: params);
       if (response.statusCode == 200) {
-        return response.data['data']['userId'];
+        return response.data['data']['userId'] as String;
       } else {
         throw "Unexpected error on create user";
       }
@@ -49,18 +48,19 @@ class FiresApi {
     try {
       final response = await _dio.get(url);
       if (response.statusCode == 200) {
-        final dataSubscriptions = response.data['data']['subscriptions'];
+        final dataSubscriptions =
+            response.data['data']['subscriptions'] as List<dynamic>;
         List<YourLocation> subscribed = [];
         for (int i = 0; i < dataSubscriptions.length; i++) {
-          var el = dataSubscriptions[i];
-          var lat = el['location']['lat'];
-          var lon = el['location']['lon'];
+          var el = dataSubscriptions[i] as Map<String, dynamic>;
+          var lat = (el['location']['lat'] as num).toDouble();
+          var lon = (el['location']['lon'] as num).toDouble();
           subscribed.add(YourLocation(
-              id: objectIdFromJson(el['_id']['_str']),
+              id: objectIdFromJson(el['_id']['_str'] as String),
               lat: lat,
               lon: lon,
               subscribed: true,
-              distance: el['distance']));
+              distance: (el['distance'] as num).toInt()));
         }
         return subscribed;
       } else {
@@ -84,7 +84,7 @@ class FiresApi {
     try {
       final response = await _dio.post(url, data: params);
       if (response.statusCode == 200) {
-        return response.data['data']['subsId'];
+        return response.data['data']['subsId'] as String;
       } else {
         print(response.data);
         throw "Unexpected error on subscribe";
@@ -123,10 +123,10 @@ class FiresApi {
       final response = await _dio.get(url);
       if (response.statusCode == 200) {
         var resultDecoded = response.data;
-        int numFires = resultDecoded['real'];
-        List fires = resultDecoded['fires'];
-        List falsePos = resultDecoded['falsePos'];
-        List industries = resultDecoded['industries'];
+        int numFires = (resultDecoded['real'] as num).toInt();
+        List<dynamic> fires = resultDecoded['fires'] as List<dynamic>;
+        List<dynamic> falsePos = resultDecoded['falsePos'] as List<dynamic>;
+        List<dynamic> industries = resultDecoded['industries'] as List<dynamic>;
 
         if (globals.isDevelopment) {
           var firesCount = fires.length;
@@ -157,13 +157,18 @@ class FiresApi {
         var resultDecoded = response.data;
         List<Polyline> union = [];
         final multipolygon =
-            json.decode(resultDecoded['data']['union']['value'])['geometry']
-                ['coordinates'];
-        for (List<dynamic> polygon in multipolygon) {
-          for (List<dynamic> hole in polygon) {
+            (json.decode(resultDecoded['data']['union']['value'] as String)
+                    as Map<String, dynamic>)['geometry']['coordinates']
+                as List<dynamic>;
+        for (dynamic polygonDynamic in multipolygon) {
+          var polygon = polygonDynamic as List<dynamic>;
+          for (dynamic holeDynamic in polygon) {
+            var hole = holeDynamic as List<dynamic>;
             List<LatLng> points = [];
-            for (List<dynamic> point in hole) {
-              points.add(LatLng(point[1].toDouble(), point[0].toDouble()));
+            for (dynamic pointDynamic in hole) {
+              var point = pointDynamic as List<dynamic>;
+              points.add(LatLng(
+                  (point[1] as num).toDouble(), (point[0] as num).toDouble()));
             }
             union.add(Polyline(points: points, color: color, strokeWidth: 3.0));
           }
@@ -178,7 +183,6 @@ class FiresApi {
 
   Future<bool> markFalsePositive(AppState state, String mobileToken,
       String sealed, FalsePositiveType type) async {
-
     final params = {
       "token": state.firesApiKey,
       "mobileToken": mobileToken,