build: upgrade to Flutter 3.47.4 (AGP 9.1 / Gradle 9.3, iOS 15 + UIScene), refresh deps and CI

Flutter 3.24.5 -> 3.47.4 with the matching toolchain changes:

- pubspec: Dart ^3.11, Firebase core 4 / auth 6 / firestore 6 / storage 13,
  drop unused image_cropper, logging, change_app_package_name,
  pdf_widget_wrapper; pin path_provider_android <2.3 (needs NDK/CMake, not
  feasible on the ARM64 Gitea runner)
- Dart: CardTheme -> CardThemeData, replace deprecated withOpacity,
  Matrix4.scale, DropdownButtonFormField.value
- iOS: deployment target 15.0, UIScene lifecycle (AppDelegate/Info.plist),
  untrack stale Podfile.lock, add LaunchImage asset set
- Android: Gradle 9.3.1, AGP 9.1.0, Kotlin 2.4.0, google-services 4.5.0,
  layout.buildDirectory instead of removed Project.buildDir, remove manifest
  package attribute and duplicate MainActivity, kotlin.incremental=false
- CI: pin FLUTTER_VERSION in both workflows; iOS on macos-26 with SwiftPM
  disabled (CocoaPods only); Gitea job keeps cirruslabs 3.44.0 as base image
  (images discontinued) and switches the bundled Flutter SDK by git tag

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

lib/main.dart

@@ -38,7 +38,7 @@ class MyApp extends StatelessWidget {
           backgroundColor: Colors.white,
           foregroundColor: Colors.black87,
         ),
-        cardTheme: CardTheme(
+        cardTheme: CardThemeData(
           elevation: 1,
           shape: RoundedRectangleBorder(
             borderRadius: BorderRadius.circular(10),

lib/screens/add_issue_screen.dart

@@ -215,7 +215,7 @@ class _AddIssueScreenState extends State<AddIssueScreen> {
               ),
               const SizedBox(height: 16),
               DropdownButtonFormField<String>(
-                value: _selectedStreet,
+                initialValue: _selectedStreet,
                 decoration: const InputDecoration(
                   labelText: 'Straße / Örtlichkeit *',
                   border: OutlineInputBorder(),
@@ -232,7 +232,7 @@ class _AddIssueScreenState extends State<AddIssueScreen> {
               ),
               const SizedBox(height: 16),
               DropdownButtonFormField<String>(
-                value: _selectedCategory,
+                initialValue: _selectedCategory,
                 decoration: const InputDecoration(
                   labelText: 'Grundlage / Kategorie *',
                   border: OutlineInputBorder(),

lib/screens/admin_messages_screen.dart

@@ -284,7 +284,7 @@ class _AdminMessagesScreenState extends State<AdminMessagesScreen> {
     return Expanded(
       child: OutlinedButton(
         style: OutlinedButton.styleFrom(
-          backgroundColor: isCurrent ? color.withOpacity(0.15) : null,
+          backgroundColor: isCurrent ? color.withValues(alpha: 0.15) : null,
           side: BorderSide(
             color: isCurrent ? color : Colors.grey.shade300,
             width: isCurrent ? 2 : 1,
@@ -332,7 +332,7 @@ class _AdminMessagesScreenState extends State<AdminMessagesScreen> {
       decoration: BoxDecoration(
         color: bg,
         borderRadius: BorderRadius.circular(12),
-        border: Border.all(color: fg.withOpacity(0.3)),
+        border: Border.all(color: fg.withValues(alpha: 0.3)),
       ),
       child: Text(
         status,

lib/screens/auth_dialog.dart

@@ -291,7 +291,7 @@ class _AuthDialogState extends State<AuthDialog>
                         child: Image.asset(
                           'assets/images/logo.png',
                           height: 28,
-                          errorBuilder: (_, __, ___) => const Icon(
+                          errorBuilder: (_, _, _) => const Icon(
                             Icons.campaign,
                             color: Colors.blue,
                           ),

lib/screens/pdf_viewer_screen.dart

@@ -34,14 +34,14 @@ class _PdfViewerScreenState extends State<PdfViewerScreen> {
   void _zoomIn() {
     setState(() {
       _zoomLevel = (_zoomLevel * 1.3).clamp(0.8, 5.0);
-      _transformationController.value = Matrix4.identity()..scale(_zoomLevel);
+      _transformationController.value = Matrix4.diagonal3Values(_zoomLevel, _zoomLevel, _zoomLevel);
     });
   }
 
   void _zoomOut() {
     setState(() {
       _zoomLevel = (_zoomLevel / 1.3).clamp(0.8, 5.0);
-      _transformationController.value = Matrix4.identity()..scale(_zoomLevel);
+      _transformationController.value = Matrix4.diagonal3Values(_zoomLevel, _zoomLevel, _zoomLevel);
     });
   }
 
@@ -196,7 +196,7 @@ class _PdfViewerScreenState extends State<PdfViewerScreen> {
                               borderRadius: BorderRadius.circular(4),
                               boxShadow: [
                                 BoxShadow(
-                                  color: Colors.black.withOpacity(0.15),
+                                  color: Colors.black.withValues(alpha: 0.15),
                                   blurRadius: 10,
                                   offset: const Offset(0, 3),
                                 ),
@@ -235,7 +235,7 @@ class _PdfViewerScreenState extends State<PdfViewerScreen> {
               elevation: 4,
               shape: RoundedRectangleBorder(
                   borderRadius: BorderRadius.circular(24)),
-              color: Colors.white.withOpacity(0.92),
+              color: Colors.white.withValues(alpha: 0.92),
               child: Padding(
                 padding: const EdgeInsets.symmetric(vertical: 4, horizontal: 2),
                 child: Column(

lib/services/firestore_service.dart

@@ -118,8 +118,8 @@ class FirestoreService {
           'firstName': firstName,
         if (lastName != null && lastName.isNotEmpty)
           'lastName': lastName,
-        if (emailVerified != null) 'emailVerified': emailVerified,
-        if (isAdmin != null) 'isAdmin': isAdmin,
+        'emailVerified': ?emailVerified,
+        'isAdmin': ?isAdmin,
       };
 
       if (!doc.exists) {