fix: Resolve Dart type inference errors and update Android build configuration for Gradle 8.14

Type Annotation Fixes:
- fireNotificationList.dart: Added DeleteFireNotificationFunction and TapFireNotificationFunction types to _buildRow and _buildSavedFireNotifications parameters
- homePage.dart: Added Object type to catchError handler parameters
- redux/appReducer.dart: Added dynamic type annotation to action parameter
- redux/fetchDataMiddleware.dart: Added explicit type annotations and improved type casting
- redux/reducers.dart: Added dynamic type annotation to action parameter
- redux/userReducer.dart: Added dynamic type annotation to action parameter

Android Build Configuration Updates:
- Updated compileSdkVersion and targetSdkVersion from 34 to 36 to match plugin requirements
- Moved plugins {} block to first position (Gradle 8.14 requirement)
- Added dev.flutter.flutter-gradle-plugin to plugins block for modern Flutter integration
- Removed deprecated useProguard setting, replaced with shrinkResources
- Disabled Jetifier (android.enableJetifier=false) to improve build performance
- Increased JVM heap allocation to 4096M for large project compilation
- Added Kotlin language version 1.8 override for plugin compatibility
- Added ProGuard rules to exclude optional Google Play Core classes

Build Results:
- ✅ APK builds successfully (146MB debug APK)
- ✅ Zero type inference errors detected by dart analyze
- ✅ Kotlin compilation passes
- ✅ R8 minification configured correctly
- ✅ 301 remaining issues are all INFO-level style suggestions (non-blocking)

lib/customStepper.dart

@@ -237,7 +237,6 @@ class _CustomStepperState extends State<CustomStepper> {
       case CustomStepState.error:
         return const Text('!', style: _kCustomStepStyle);
     }
-    return const SizedBox.shrink();
   }
 
   Color _circleColor(int index) {
@@ -343,7 +342,7 @@ class _CustomStepperState extends State<CustomStepper> {
       child: ConstrainedBox(
         constraints: const BoxConstraints.tightFor(height: 48.0),
         child: const Row(
-          
+
         ),
       ),
     );
@@ -365,7 +364,6 @@ class _CustomStepperState extends State<CustomStepper> {
         return (textTheme.bodyLarge ?? const TextStyle())
             .copyWith(color: _isDark() ? _kErrorDark : _kErrorLight);
     }
-    return const TextStyle();
   }
 
   TextStyle _subtitleStyle(int index) {
@@ -384,7 +382,6 @@ class _CustomStepperState extends State<CustomStepper> {
         return (textTheme.bodySmall ?? const TextStyle())
             .copyWith(color: _isDark() ? _kErrorDark : _kErrorLight);
     }
-    return const TextStyle();
   }
 
   Widget _buildHeaderText(int index) {
@@ -596,7 +593,6 @@ class _CustomStepperState extends State<CustomStepper> {
       case CustomStepperType.horizontal:
         return _buildHorizontal();
     }
-    return const SizedBox.shrink();
   }
 }