fix: temporary directory web

app/lib/screens/app_onboarding/preview.dart

@@ -66,15 +66,17 @@ class Preview {
     // delete study subscription and progress
     if (containsQueryPair('cmd', 'reset')) {
       if (selectedStudyObjectId != null) {
-        final StudySubject subject = await SupabaseQuery.getById<StudySubject>(
-          selectedStudyObjectId!,
-          selectedColumns: [
-            '*',
-            'study!study_subject_studyId_fkey(*)',
-            'subject_progress(*)',
-          ],
-        );
-        subject.delete();
+        final List<StudySubject> subjects =
+            await SupabaseQuery.getAll<StudySubject>();
+
+        final List<StudySubject> subjectsToDelete = subjects
+            .where((subject) =>
+                subject.userId == Supabase.instance.client.auth.currentUser!.id,)
+            .toList();
+
+        subjectsToDelete.forEach((subject) async {
+          await subject.delete();
+        });
         deleteActiveStudyReference();
         selectedStudyObjectId = '';
       }

app/lib/util/debug_screen.dart

@@ -215,10 +215,13 @@ class DebugScreen {
   }
 
   static Future<void> _deleteCacheDir() async {
-    final cacheDir = await getTemporaryDirectory();
-
-    if (cacheDir.existsSync()) {
-      cacheDir.deleteSync(recursive: true);
+    try {
+      final cacheDir = await getTemporaryDirectory();
+      if (cacheDir.existsSync()) {
+        cacheDir.deleteSync(recursive: true);
+      }
+    } catch (e) {
+      StudyULogger.error(e);
     }
   }
 

app/lib/util/temporary_storage_handler.dart

@@ -22,11 +22,25 @@ class TemporaryStorageHandler {
   }
 
   static Future<Directory> _getMultimodalTempDirectory() async {
-    final tempAppData = await getTemporaryDirectory();
-    final multimodalTempDirectory =
-        Directory("${tempAppData.path}/multimodal-temp");
-    await multimodalTempDirectory.create(recursive: true);
-    return multimodalTempDirectory;
+    try {
+      final tempAppData = await getTemporaryDirectory();
+      final multimodalTempDirectory =
+          Directory("${tempAppData.path}/multimodal-temp");
+
+      if (!await multimodalTempDirectory.exists()) {
+        await multimodalTempDirectory.create(recursive: true);
+      }
+
+      return multimodalTempDirectory;
+    } catch (e) {
+      StudyULogger.error("Failed to create multimodal temp directory: $e");
+
+      final fallbackDirectory =
+          Directory("${Directory.systemTemp.path}/multimodal-temp-fallback");
+
+      await fallbackDirectory.create(recursive: true);
+      return fallbackDirectory;
+    }
   }
 
   static Future<Directory> _getMultimodalUploadDirectory() async {
@@ -66,6 +80,7 @@ class TemporaryStorageHandler {
 
   Future<FutureBlobFile> getStagingAudio() async {
     final temporaryMultimodalDirectory = await _getMultimodalTempDirectory();
+
     final fileName = _buildFileName();
     final localFilePath = path.join(
       temporaryMultimodalDirectory.path,
@@ -75,6 +90,7 @@ class TemporaryStorageHandler {
         TemporaryStorageHandler._audioFileType,
       ].join(),
     );
+
     final futureBlobId =
         [fileName, TemporaryStorageHandler._audioFileType].join();
     return FutureBlobFile(localFilePath, futureBlobId);
@@ -91,6 +107,7 @@ class TemporaryStorageHandler {
         TemporaryStorageHandler._imageFileType,
       ].join(),
     );
+
     final futureBlobId =
         [fileName, TemporaryStorageHandler._imageFileType].join();
     return FutureBlobFile(localFilePath, futureBlobId);