fix(desktop): fix Windows 10 crash vectors across screens, dialogs, and audio

frontend/lib/core/services/sound_service.dart

@@ -1,3 +1,4 @@
+import 'dart:io' show Platform;
 import 'package:audioplayers/audioplayers.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/services.dart';
@@ -12,11 +13,14 @@ class SoundService {
   static bool get isMuted => _muted;
   static set isMuted(bool value) => _muted = value;
 
+  static bool get _isDesktop =>
+      !kIsWeb && (Platform.isWindows || Platform.isLinux || Platform.isMacOS);
+
   static void _ensureInitialized() {
+    if (_isDesktop) return;
     if (_initialized && _player != null) return;
     try {
       _player = AudioPlayer();
-      _player!.setPlayerMode(PlayerMode.lowLatency);
       _player!.setVolume(1.0);
       _initialized = true;
     } catch (e) {
@@ -27,13 +31,20 @@ class SoundService {
   static Future<void> _playSound(String assetFileName, {bool isErrorOrAlert = false}) async {
     if (_muted) return;
     try {
+      if (_isDesktop) {
+        if (isErrorOrAlert) {
+          await SystemSound.play(SystemSoundType.alert);
+        } else {
+          await SystemSound.play(SystemSoundType.click);
+        }
+        return;
+      }
+
       _ensureInitialized();
       if (_player != null) {
-        // Stop current sound if playing, then play new sound
         await _player!.stop();
         await _player!.play(AssetSource('sounds/$assetFileName'));
       } else {
-        // Fallback to system sound
         if (isErrorOrAlert) {
           await SystemSound.play(SystemSoundType.alert);
         } else {

frontend/lib/core/utils/download_service.dart

@@ -17,6 +17,14 @@ class DownloadService {
       final dir = await getDownloadsDirectory();
       if (dir != null) {
         path = '${dir.path}\\TIS_RMS';
+      } else {
+        final userProfile = Platform.environment['USERPROFILE'];
+        if (userProfile != null && userProfile.isNotEmpty) {
+          path = '$userProfile\\Downloads\\TIS_RMS';
+        } else {
+          final docsDir = await getApplicationDocumentsDirectory();
+          path = '${docsDir.path}\\TIS_RMS';
+        }
       }
     }
 
@@ -78,7 +86,16 @@ class DownloadService {
     if (!await file.exists()) {
       throw Exception('File does not exist at $filePath');
     }
-    await OpenFilex.open(filePath);
+    try {
+      final res = await OpenFilex.open(filePath);
+      if (res.type != ResultType.done && Platform.isWindows) {
+        await Process.run('explorer.exe', [filePath]);
+      }
+    } catch (_) {
+      if (Platform.isWindows) {
+        await Process.run('explorer.exe', [filePath]);
+      }
+    }
   }
 
   /// Opens the storage directory (Download/TIS_RMS) or highlights the file in File Explorer.
@@ -105,12 +122,14 @@ class DownloadService {
         await fallback.launch();
       }
     } else if (Platform.isWindows) {
-      if (filePath != null && await File(filePath).exists()) {
-        await Process.run('explorer.exe', ['/select,', filePath]);
-      } else {
-        final dirPath = await getDownloadDirectoryPath();
-        await Process.run('explorer.exe', [dirPath]);
-      }
+      try {
+        if (filePath != null && await File(filePath).exists()) {
+          await Process.run('explorer.exe', ['/select,$filePath']);
+        } else {
+          final dirPath = await getDownloadDirectoryPath();
+          await Process.run('explorer.exe', [dirPath]);
+        }
+      } catch (_) {}
     }
   }
 }

frontend/lib/domain/repositories/document_repository.dart

@@ -61,16 +61,16 @@ class PrintQueueItem {
 
   factory PrintQueueItem.fromJson(Map<String, dynamic> json) {
     return PrintQueueItem(
-      queueId: json['queue_id'] as int,
-      documentId: json['document_id'] as int,
-      fileName: json['file_name'] as String? ?? '',
-      filePath: json['file_path'] as String? ?? '',
-      documentType: json['document_type'] as String?,
-      status: json['status'] as String? ?? 'Pending',
-      studentName: json['student_name'] as String?,
-      studentLrn: json['student_lrn'] as String?,
+      queueId: (json['queue_id'] as num?)?.toInt() ?? 0,
+      documentId: (json['document_id'] as num?)?.toInt() ?? 0,
+      fileName: json['file_name']?.toString() ?? '',
+      filePath: json['file_path']?.toString() ?? '',
+      documentType: json['document_type']?.toString(),
+      status: json['status']?.toString() ?? 'Pending',
+      studentName: json['student_name']?.toString(),
+      studentLrn: json['student_lrn']?.toString(),
       addedAt: json['added_at'] != null
-          ? DateTime.parse(json['added_at'] as String)
+          ? (DateTime.tryParse(json['added_at'].toString()) ?? DateTime.now())
           : DateTime.now(),
     );
   }
@@ -99,15 +99,15 @@ class PrintHistoryItem {
 
   factory PrintHistoryItem.fromJson(Map<String, dynamic> json) {
     return PrintHistoryItem(
-      id: json['id'] as int,
-      documentId: json['document_id'] as int,
-      documentName: json['document_name'] as String? ?? 'Document',
-      studentName: json['student_name'] as String? ?? 'Unknown',
-      studentLrn: json['student_lrn'] as String?,
-      fileName: json['file_name'] as String?,
-      documentType: json['document_type'] as String?,
+      id: (json['id'] as num?)?.toInt() ?? 0,
+      documentId: (json['document_id'] as num?)?.toInt() ?? 0,
+      documentName: json['document_name']?.toString() ?? 'Document',
+      studentName: json['student_name']?.toString() ?? 'Unknown',
+      studentLrn: json['student_lrn']?.toString(),
+      fileName: json['file_name']?.toString(),
+      documentType: json['document_type']?.toString(),
       printedAt: json['printed_at'] != null
-          ? DateTime.parse(json['printed_at'] as String)
+          ? (DateTime.tryParse(json['printed_at'].toString()) ?? DateTime.now())
           : DateTime.now(),
     );
   }

frontend/lib/main.dart

@@ -48,25 +48,27 @@ void main() async {
   );
   SystemChrome.setEnabledSystemUIMode(SystemUiMode.edgeToEdge);
 
-  final view = WidgetsBinding.instance.platformDispatcher.views.first;
-  final physicalSize = view.physicalSize;
-  final devicePixelRatio = view.devicePixelRatio;
-  final width = physicalSize.width / devicePixelRatio;
-  final height = physicalSize.height / devicePixelRatio;
-  final shortestSide = width < height ? width : height;
+  final view = WidgetsBinding.instance.platformDispatcher.views.firstOrNull;
+  if (view != null) {
+    final physicalSize = view.physicalSize;
+    final devicePixelRatio = view.devicePixelRatio;
+    final width = physicalSize.width / devicePixelRatio;
+    final height = physicalSize.height / devicePixelRatio;
+    final shortestSide = width < height ? width : height;
 
-  if (shortestSide < 600) {
-    await SystemChrome.setPreferredOrientations([
-      DeviceOrientation.portraitUp,
-      DeviceOrientation.portraitDown,
-    ]);
-  } else {
-    await SystemChrome.setPreferredOrientations([
-      DeviceOrientation.portraitUp,
-      DeviceOrientation.portraitDown,
-      DeviceOrientation.landscapeLeft,
-      DeviceOrientation.landscapeRight,
-    ]);
+    if (shortestSide < 600) {
+      await SystemChrome.setPreferredOrientations([
+        DeviceOrientation.portraitUp,
+        DeviceOrientation.portraitDown,
+      ]);
+    } else {
+      await SystemChrome.setPreferredOrientations([
+        DeviceOrientation.portraitUp,
+        DeviceOrientation.portraitDown,
+        DeviceOrientation.landscapeLeft,
+        DeviceOrientation.landscapeRight,
+      ]);
+    }
   }
 
   await NotificationService().initialize();

frontend/lib/ui/screens/archives/archives_screen.dart

@@ -560,7 +560,8 @@ class _ArchivesScreenState extends ConsumerState<ArchivesScreen>
       final dirPath = await DownloadService.getDownloadDirectoryPath();
 
       for (final docId in _selectedDocumentIds) {
-        final doc = docs.firstWhere((d) => d.id == docId);
+        final doc = docs.where((d) => d.id == docId).firstOrNull;
+        if (doc == null) continue;
         final url =
             '${ApiConstants.baseUrl}/documents/${doc.id}/view?token=$token&download=true';
         lastSavedPath = await DownloadService.downloadFile(url: url, fileName: doc.fileName);
@@ -1867,8 +1868,9 @@ class _ArchivesScreenState extends ConsumerState<ArchivesScreen>
     final studentName =
         '${folder.studentLastName ?? ''}, ${folder.studentFirstName ?? ''}';
 
-    final RenderBox overlay =
-        Overlay.of(context).context.findRenderObject() as RenderBox;
+    final RenderBox? overlay =
+        Overlay.maybeOf(context)?.context.findRenderObject() as RenderBox?;
+    if (overlay == null) return;
     final value = await showMenu<String>(
       context: context,
       position: RelativeRect.fromRect(

frontend/lib/ui/screens/dashboard/dashboard_screen.dart

@@ -173,9 +173,11 @@ class _DashboardScreenState extends ConsumerState<DashboardScreen> {
     final notificationsAsync = ref.read(notificationsProvider);
     final list = notificationsAsync.value ?? [];
 
-    final RenderBox button = context.findRenderObject() as RenderBox;
-    final RenderBox overlay =
-        Navigator.of(context).overlay!.context.findRenderObject() as RenderBox;
+    final RenderBox? button = context.findRenderObject() as RenderBox?;
+    final RenderBox? overlay =
+        Navigator.of(context).overlay?.context.findRenderObject() as RenderBox?;
+    if (button == null || overlay == null) return;
+
     final position = RelativeRect.fromRect(
       Rect.fromPoints(
         button.localToGlobal(Offset.zero, ancestor: overlay),

frontend/lib/ui/screens/documents/documents_screen.dart

@@ -524,7 +524,8 @@ class _DocumentsScreenState extends ConsumerState<DocumentsScreen>
       int successCount = 0;
 
       for (final docId in _selectedDocumentIds) {
-        final doc = docs.firstWhere((d) => d.id == docId);
+        final doc = docs.where((d) => d.id == docId).firstOrNull;
+        if (doc == null) continue;
         final url =
             '${ApiConstants.baseUrl}/documents/${doc.id}/view?token=$token&download=true';
         await DownloadService.downloadFile(url: url, fileName: doc.fileName);
@@ -2428,8 +2429,9 @@ class _DocumentsScreenState extends ConsumerState<DocumentsScreen>
   ) async {
     if (folder.studentId == null) return;
 
-    final RenderBox overlay =
-        Overlay.of(context).context.findRenderObject() as RenderBox;
+    final RenderBox? overlay =
+        Overlay.maybeOf(context)?.context.findRenderObject() as RenderBox?;
+    if (overlay == null) return;
     final value = await showMenu<String>(
       context: context,
       position: RelativeRect.fromRect(

frontend/lib/ui/screens/documents/widgets/file_folder_card.dart

@@ -226,8 +226,9 @@ class _FileFolderCardState extends State<FileFolderCard> {
 
   void _showContextMenu(BuildContext context, Offset position) {
     if (widget.isMultiSelectMode) return;
-    final RenderBox overlay =
-        Overlay.of(context).context.findRenderObject() as RenderBox;
+    final RenderBox? overlay =
+        Overlay.maybeOf(context)?.context.findRenderObject() as RenderBox?;
+    if (overlay == null) return;
     showMenu<String>(
       context: context,
       position: RelativeRect.fromRect(

frontend/lib/ui/screens/documents/widgets/student_profile_modal.dart

@@ -3,6 +3,7 @@ import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import '../../../../core/constants/app_colors.dart';
+import '../../../../core/services/haptic_service.dart';
 import '../../../../domain/repositories/document_repository.dart'
     show MissingRequirements;
 import '../../../../domain/entities/document_requirement_model.dart';
@@ -1182,7 +1183,7 @@ class _CopyableLrnButtonState extends State<_CopyableLrnButton> {
     if (lrn.isEmpty) return;
 
     Clipboard.setData(ClipboardData(text: lrn));
-    HapticFeedback.lightImpact();
+    HapticService.light();
 
     setState(() {
       _copied = true;

frontend/lib/ui/screens/documents/widgets/upload_ocr_modal.dart

@@ -151,6 +151,15 @@ class _UploadOcrModalState extends ConsumerState<UploadOcrModal> {
   // Requirements strip expand/collapse state
   bool _requirementsExpanded = true;
 
+  int _safeFileSize(File file) {
+    try {
+      if (file.existsSync()) {
+        return file.lengthSync();
+      }
+    } catch (_) {}
+    return 0;
+  }
+
   @override
   void initState() {
     super.initState();
@@ -171,7 +180,7 @@ class _UploadOcrModalState extends ConsumerState<UploadOcrModal> {
     // Pre-populate entries from drag-and-drop files
     if (widget.preloadedFiles != null && widget.preloadedFiles!.isNotEmpty) {
       _entries = widget.preloadedFiles!.map((f) {
-        final bytes = f.lengthSync();
+        final bytes = _safeFileSize(f);
         final kb = bytes / 1024;
         final size = kb >= 1024
             ? '${(kb / 1024).toStringAsFixed(1)} MB'
@@ -326,7 +335,7 @@ class _UploadOcrModalState extends ConsumerState<UploadOcrModal> {
       final ext = path.split('.').last.toLowerCase();
       if (!allowed.contains(ext)) continue;
       final file = File(path);
-      final len = file.lengthSync();
+      final len = _safeFileSize(file);
       final sizeKb = (len / 1024).toStringAsFixed(1);
       final sizeLabel = len > 1048576
           ? '${(len / 1048576).toStringAsFixed(1)} MB'
@@ -569,6 +578,7 @@ class _UploadOcrModalState extends ConsumerState<UploadOcrModal> {
   }
 
   Future<void> _scanDocument() async {
+    if (!Platform.isAndroid && !Platform.isIOS) return;
     try {
       final scanner = DocumentScanner(
         options: DocumentScannerOptions(
@@ -604,9 +614,10 @@ class _UploadOcrModalState extends ConsumerState<UploadOcrModal> {
 
       if (format == ScannedSaveFormat.pdf && hasPdf) {
         final file = File(result.pdf!.uri);
-        final sizeKb = (file.lengthSync() / 1024).toStringAsFixed(1);
-        final sizeLabel = file.lengthSync() > 1048576
-            ? '${(file.lengthSync() / 1048576).toStringAsFixed(1)} MB'
+        final len = _safeFileSize(file);
+        final sizeKb = (len / 1024).toStringAsFixed(1);
+        final sizeLabel = len > 1048576
+            ? '${(len / 1048576).toStringAsFixed(1)} MB'
             : '$sizeKb KB';
         final name = 'Scanned_Doc_$timestamp.pdf';
 
@@ -630,9 +641,10 @@ class _UploadOcrModalState extends ConsumerState<UploadOcrModal> {
           final imagePath = result.images![i];
           final file = File(imagePath);
           if (!file.existsSync()) continue;
-          final sizeKb = (file.lengthSync() / 1024).toStringAsFixed(1);
-          final sizeLabel = file.lengthSync() > 1048576
-              ? '${(file.lengthSync() / 1048576).toStringAsFixed(1)} MB'
+          final len = _safeFileSize(file);
+          final sizeKb = (len / 1024).toStringAsFixed(1);
+          final sizeLabel = len > 1048576
+              ? '${(len / 1048576).toStringAsFixed(1)} MB'
               : '$sizeKb KB';
           final pageSuffix =
               result.images!.length > 1 ? '_page${i + 1}' : '';

frontend/lib/ui/screens/reports/reports_screen.dart

@@ -3568,9 +3568,11 @@ class _ReportsScreenState extends ConsumerState<ReportsScreen> {
     List<String> allYears,
     Set<String> selected,
   ) {
-    final RenderBox button = context.findRenderObject() as RenderBox;
-    final RenderBox overlay =
-        Overlay.of(context).context.findRenderObject() as RenderBox;
+    final RenderBox? button = context.findRenderObject() as RenderBox?;
+    final RenderBox? overlay =
+        Overlay.maybeOf(context)?.context.findRenderObject() as RenderBox?;
+    if (button == null || overlay == null) return;
+
     final RelativeRect position = RelativeRect.fromRect(
       Rect.fromPoints(
         button.localToGlobal(Offset.zero, ancestor: overlay),
@@ -3742,9 +3744,11 @@ class _ReportsScreenState extends ConsumerState<ReportsScreen> {
     List<_StatusOption> options,
     Set<String> selected,
   ) {
-    final RenderBox button = context.findRenderObject() as RenderBox;
-    final RenderBox overlay =
-        Overlay.of(context).context.findRenderObject() as RenderBox;
+    final RenderBox? button = context.findRenderObject() as RenderBox?;
+    final RenderBox? overlay =
+        Overlay.maybeOf(context)?.context.findRenderObject() as RenderBox?;
+    if (button == null || overlay == null) return;
+
     final RelativeRect position = RelativeRect.fromRect(
       Rect.fromPoints(
         button.localToGlobal(Offset.zero, ancestor: overlay),

frontend/lib/ui/screens/students/students_screen.dart

@@ -7,6 +7,7 @@ import 'package:flutter/services.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import '../../../core/constants/app_colors.dart';
 import '../../../core/constants/app_sizes.dart';
+import '../../../core/services/haptic_service.dart';
 import '../../../domain/entities/student_model.dart';
 import '../../../domain/entities/setup_models.dart';
 import '../../shared/buttons/primary_button.dart';
@@ -353,8 +354,9 @@ class _StudentsScreenState extends ConsumerState<StudentsScreen> {
     Offset globalPosition,
     StudentModel student,
   ) async {
-    final RenderBox overlay =
-        Overlay.of(ctx).context.findRenderObject()! as RenderBox;
+    final RenderBox? overlay =
+        Overlay.maybeOf(ctx)?.context.findRenderObject() as RenderBox?;
+    if (overlay == null) return;
     final RelativeRect position = RelativeRect.fromRect(
       Rect.fromLTWH(globalPosition.dx, globalPosition.dy, 0, 0),
       Offset.zero & overlay.size,
@@ -1403,7 +1405,7 @@ class _StudentsScreenState extends ConsumerState<StudentsScreen> {
                     behavior: HitTestBehavior.opaque,
                     onTap: widget.userRole != 'teacher'
                         ? () {
-                            HapticFeedback.selectionClick();
+                            HapticService.selection();
                             _updateSelection(() {
                               if (!_showMultiSelect) {
                                 _showMultiSelect = true;
@@ -1668,7 +1670,7 @@ class _StudentsScreenState extends ConsumerState<StudentsScreen> {
                     behavior: HitTestBehavior.opaque,
                     onTap: widget.userRole != 'teacher'
                         ? () {
-                            HapticFeedback.selectionClick();
+                            HapticService.selection();
                             _updateSelection(() {
                               if (!_showMultiSelect) {
                                 _showMultiSelect = true;

frontend/lib/ui/shared/dialogs/confirm_dialog.dart

@@ -34,13 +34,17 @@ Future<bool?> showConfirmDialog(
   final effectiveConfirmColor = confirmColor ?? (isDanger ? AppColors.error : AppColors.primaryGreen);
   final effectiveIcon = icon ?? (isDanger ? Icons.warning_amber_rounded : Icons.help_outline_rounded);
 
-  if (isDanger) {
-    SoundService.playWarning();
-    HapticService.warning();
-  } else {
-    SoundService.playConfirm();
-    HapticService.medium();
-  }
+  if (!context.mounted) return Future.value(false);
+
+  try {
+    if (isDanger) {
+      SoundService.playWarning();
+      HapticService.warning();
+    } else {
+      SoundService.playConfirm();
+      HapticService.medium();
+    }
+  } catch (_) {}
 
   return showDialog<bool>(
     context: context,

frontend/lib/ui/shared/dialogs/disconnected_dialog.dart

@@ -22,10 +22,13 @@ class DisconnectedDialog extends StatefulWidget {
     BuildContext context, {
     VoidCallback? onReconnected,
   }) async {
+    if (!context.mounted) return;
     if (_isShowing) return;
     _isShowing = true;
-    SoundService.playError();
-    HapticService.error();
+    try {
+      SoundService.playError();
+      HapticService.error();
+    } catch (_) {}
 
     await showDialog<void>(
       context: context,

frontend/lib/ui/shared/dialogs/document_properties_dialog.dart

@@ -18,6 +18,7 @@ class DocumentPropertiesDialog extends StatelessWidget {
     BuildContext context, {
     required DocumentModel document,
   }) {
+    if (!context.mounted) return Future.value();
     return showDialog(
       context: context,
       builder: (ctx) => DocumentPropertiesDialog(document: document),

frontend/lib/ui/shared/dialogs/error_dialog.dart

@@ -19,8 +19,15 @@ void showErrorDialog(
   String buttonLabel = 'OK',
   VoidCallback? onDismissed,
 }) {
-  SoundService.playError();
-  HapticService.error();
+  try {
+    SoundService.playError();
+  } catch (_) {}
+  try {
+    HapticService.error();
+  } catch (_) {}
+
+  if (!context.mounted) return;
+
   showDialog(
     context: context,
     barrierDismissible: false,

frontend/lib/ui/shared/dialogs/file_save_preview_dialog.dart

@@ -111,6 +111,7 @@ Future<bool?> showFileSavePreviewDialog(
   File? imageFile,
   required Future<void> Function(String resolvedFileName) onSave,
 }) {
+  if (!context.mounted) return Future.value(null);
   return showDialog<bool>(
     context: context,
     barrierDismissible: false,

frontend/lib/ui/shared/dialogs/info_dialog.dart

@@ -27,17 +27,21 @@ void showInfoDialog(
 }) {
   final btnColor = buttonColor ?? iconColor;
 
-  if (iconColor == AppColors.error ||
-      iconColor == Colors.red ||
-      iconColor == Colors.orange ||
-      title.toLowerCase().contains('warning') ||
-      title.toLowerCase().contains('alert')) {
-    SoundService.playWarning();
-    HapticService.warning();
-  } else {
-    SoundService.playInfo();
-    HapticService.info();
-  }
+  if (!context.mounted) return;
+
+  try {
+    if (iconColor == AppColors.error ||
+        iconColor == Colors.red ||
+        iconColor == Colors.orange ||
+        title.toLowerCase().contains('warning') ||
+        title.toLowerCase().contains('alert')) {
+      SoundService.playWarning();
+      HapticService.warning();
+    } else {
+      SoundService.playInfo();
+      HapticService.info();
+    }
+  } catch (_) {}
 
   showDialog(
     context: context,

frontend/lib/ui/shared/dialogs/logout_dialog.dart

@@ -8,8 +8,11 @@ import '../../screens/login/login_screen.dart';
 
 /// A reusable function to show the logout confirmation and handle the logout process.
 Future<void> showLogoutConfirmationDialog(BuildContext context) async {
-  SoundService.playWarning();
-  HapticService.warning();
+  if (!context.mounted) return;
+  try {
+    SoundService.playWarning();
+    HapticService.warning();
+  } catch (_) {}
   return showDialog(
     context: context,
     builder: (ctx) => Consumer(

frontend/lib/ui/shared/dialogs/success_dialog.dart

@@ -24,8 +24,15 @@ Future<void> showSuccessDialog(
   String? filePath,
   String? notes,
 }) {
-  SoundService.playSuccess();
-  HapticService.success();
+  try {
+    SoundService.playSuccess();
+  } catch (_) {}
+  try {
+    HapticService.success();
+  } catch (_) {}
+
+  if (!context.mounted) return Future.value();
+
   return showDialog<void>(
     context: context,
     barrierDismissible: false,

frontend/lib/ui/shared/dialogs/warning_dialog.dart

@@ -19,8 +19,14 @@ void showWarningDialog(
   String buttonLabel = 'Got It',
   VoidCallback? onDismissed,
 }) {
-  SoundService.playWarning();
-  HapticService.warning();
+  try {
+    SoundService.playWarning();
+  } catch (_) {}
+  try {
+    HapticService.warning();
+  } catch (_) {}
+
+  if (!context.mounted) return;
 
   final isDark = Theme.of(context).brightness == Brightness.dark;
   final textPrimary = isDark ? AppColors.darkTextPrimary : AppColors.textPrimary;

frontend/lib/ui/shared/inputs/document_source_picker.dart

@@ -36,6 +36,15 @@ class _DocumentSourcePickerState extends State<DocumentSourcePicker> {
     super.dispose();
   }
 
+  int _safeFileSize(File file) {
+    try {
+      if (file.existsSync()) {
+        return file.lengthSync();
+      }
+    } catch (_) {}
+    return 0;
+  }
+
   Future<void> _pickFile() async {
     try {
       final allowed =
@@ -46,9 +55,10 @@ class _DocumentSourcePickerState extends State<DocumentSourcePicker> {
         allowedExtensions: allowed,
       );
 
-      if (result != null) {
+      if (result != null && result.files.single.path != null) {
         final file = File(result.files.single.path!);
-        final size = (file.lengthSync() / (1024 * 1024)).toStringAsFixed(2);
+        final bytes = _safeFileSize(file);
+        final size = (bytes / (1024 * 1024)).toStringAsFixed(2);
         // Send the data back to the parent screen
         widget.onFileSelected(file, result.files.single.name, '$size MB');
       }
@@ -58,6 +68,7 @@ class _DocumentSourcePickerState extends State<DocumentSourcePicker> {
   }
 
   Future<void> _takePhoto() async {
+    if (!Platform.isAndroid && !Platform.isIOS) return;
     try {
       final scanner = DocumentScanner(
         options: DocumentScannerOptions(
@@ -75,7 +86,8 @@ class _DocumentSourcePickerState extends State<DocumentSourcePicker> {
       final images = result.images;
       if (images != null && images.isNotEmpty) {
         final file = File(images.first);
-        final size = (file.lengthSync() / (1024 * 1024)).toStringAsFixed(2);
+        final bytes = _safeFileSize(file);
+        final size = (bytes / (1024 * 1024)).toStringAsFixed(2);
         final name =
             'Scanned_Doc_${DateTime.now().millisecondsSinceEpoch}.jpg';
 
@@ -255,18 +267,23 @@ class _DocumentSourcePickerState extends State<DocumentSourcePicker> {
             onDragDone: (details) {
               _dragResetTimer?.cancel();
               if (mounted) setState(() => _isDragOver = false);
-              if (details.files.isNotEmpty) {
-                final xfile = details.files.first;
-                final ext = xfile.path.split('.').last.toLowerCase();
-                if (allowed.contains(ext)) {
-                  final file = File(xfile.path);
-                  final size =
-                      (file.lengthSync() / (1024 * 1024)).toStringAsFixed(2);
-                  widget.onFileSelected(file, xfile.name, '$size MB');
-                } else {
-                  widget.onError?.call(
-                      'Unsupported file format: .$ext. Allowed: ${allowed.join(', ')}');
+              try {
+                if (details.files.isNotEmpty) {
+                  final xfile = details.files.first;
+                  final ext = xfile.path.split('.').last.toLowerCase();
+                  if (allowed.contains(ext)) {
+                    final file = File(xfile.path);
+                    final bytes = _safeFileSize(file);
+                    final size =
+                        (bytes / (1024 * 1024)).toStringAsFixed(2);
+                    widget.onFileSelected(file, xfile.name, '$size MB');
+                  } else {
+                    widget.onError?.call(
+                        'Unsupported file format: .$ext. Allowed: ${allowed.join(', ')}');
+                  }
                 }
+              } catch (e) {
+                widget.onError?.call('Failed to read dropped file: $e');
               }
             },
             child: content,

frontend/lib/ui/shared/widgets/notification_icon_button.dart

@@ -24,9 +24,11 @@ void showNotificationDropdownMenu(BuildContext context, WidgetRef ref) {
   final notificationsAsync = ref.read(notificationsProvider);
   final list = notificationsAsync.value ?? [];
 
-  final RenderBox button = context.findRenderObject() as RenderBox;
-  final RenderBox overlay =
-      Navigator.of(context).overlay!.context.findRenderObject() as RenderBox;
+  final RenderBox? button = context.findRenderObject() as RenderBox?;
+  final RenderBox? overlay =
+      Navigator.of(context).overlay?.context.findRenderObject() as RenderBox?;
+  if (button == null || overlay == null) return;
+
   final position = RelativeRect.fromRect(
     Rect.fromPoints(
       button.localToGlobal(

frontend/pubspec.yaml

@@ -16,7 +16,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
 # In Windows, build-name is used as the major, minor, and patch parts
 # of the product and file versions while build-number is used as the build suffix.
-version: 1.0.13+13
+version: 1.0.22+22
 
 environment:
   sdk: ^3.11.5