import and merge

lib/screens/deck_import_screen.dart

@@ -118,7 +118,91 @@ class _DeckImportScreenState extends State<DeckImportScreen> {
       final deckStorage = DeckStorage();
       deckStorage.saveDeckSync(deck);
 
-      // Navigate back to deck list
+      showTopSnackBar(
+        context,
+        message: 'Deck created successfully',
+        backgroundColor: Colors.green,
+      );
+      Navigator.pop(context);
+    } catch (e) {
+      setState(() {
+        _errorMessage = e.toString();
+        _isLoading = false;
+      });
+    }
+  }
+
+  void _mergeWithExistingDeck() async {
+    setState(() {
+      _errorMessage = null;
+      _isLoading = true;
+    });
+
+    try {
+      if (_jsonController.text.trim().isEmpty) {
+        throw FormatException('Please enter JSON data');
+      }
+
+      final parsedDeck = _parseDeckFromJson(_jsonController.text.trim());
+      if (parsedDeck.questions.isEmpty) {
+        throw FormatException('JSON deck must contain at least one question to merge');
+      }
+
+      final deckStorage = DeckStorage();
+      final existingDecks = deckStorage.getAllDecksSync();
+      if (existingDecks.isEmpty) {
+        throw FormatException('No existing decks to merge into. Create or import a deck first.');
+      }
+
+      setState(() => _isLoading = false);
+
+      final selectedDeck = await showDialog<Deck>(
+        context: context,
+        builder: (context) => AlertDialog(
+          title: const Text('Merge with existing deck'),
+          content: SizedBox(
+            width: double.maxFinite,
+            child: ListView.builder(
+              shrinkWrap: true,
+              itemCount: existingDecks.length,
+              itemBuilder: (context, index) {
+                final deck = existingDecks[index];
+                return ListTile(
+                  title: Text(deck.title),
+                  subtitle: Text('${deck.questions.length} questions'),
+                  onTap: () => Navigator.pop(context, deck),
+                );
+              },
+            ),
+          ),
+          actions: [
+            TextButton(
+              onPressed: () => Navigator.pop(context),
+              child: const Text('Cancel'),
+            ),
+          ],
+        ),
+      );
+
+      if (selectedDeck == null || !mounted) return;
+
+      final timestamp = DateTime.now().millisecondsSinceEpoch;
+      final mergedQuestions = [
+        ...selectedDeck.questions,
+        ...parsedDeck.questions.asMap().entries.map((e) {
+          final q = e.value;
+          final i = e.key;
+          return q.copyWith(id: '${q.id}_merged_${timestamp}_$i');
+        }),
+      ];
+      final mergedDeck = selectedDeck.copyWith(questions: mergedQuestions);
+      deckStorage.saveDeckSync(mergedDeck);
+
+      showTopSnackBar(
+        context,
+        message: 'Added ${parsedDeck.questions.length} question(s) to "${selectedDeck.title}"',
+        backgroundColor: Colors.green,
+      );
       Navigator.pop(context);
     } catch (e) {
       setState(() {
@@ -391,12 +475,12 @@ class _DeckImportScreenState extends State<DeckImportScreen> {
                   crossAxisAlignment: CrossAxisAlignment.start,
                   children: [
                     Text(
-                      'Import Deck from JSON',
+                      'Import from JSON',
                       style: Theme.of(context).textTheme.titleLarge,
                     ),
                     const SizedBox(height: 8),
                     Text(
-                      'Paste your deck JSON below. The format should include id, title, description, config, and questions.',
+                      'Paste your deck JSON below. Create a new deck or merge questions into an existing one.',
                       style: Theme.of(context).textTheme.bodyMedium,
                     ),
                   ],
@@ -484,20 +568,43 @@ class _DeckImportScreenState extends State<DeckImportScreen> {
 
             if (_errorMessage != null) const SizedBox(height: 16),
 
-            // Import Button
+            // Import and Merge Buttons
-            FilledButton.icon(
+            Row(
-              onPressed: _isLoading ? null : _importDeck,
+              children: [
-              icon: _isLoading
+                Expanded(
-                  ? const SizedBox(
+                  child: OutlinedButton.icon(
-                      width: 20,
+                    onPressed: _isLoading ? null : _mergeWithExistingDeck,
-                      height: 20,
+                    icon: _isLoading
-                      child: CircularProgressIndicator(strokeWidth: 2),
+                        ? const SizedBox(
-                    )
+                            width: 20,
-                  : const Icon(Icons.upload),
+                            height: 20,
-              label: Text(_isLoading ? 'Importing...' : 'Import Deck'),
+                            child: CircularProgressIndicator(strokeWidth: 2),
-              style: FilledButton.styleFrom(
+                          )
-                padding: const EdgeInsets.symmetric(vertical: 16),
+                        : const Icon(Icons.merge_type, size: 20),
-              ),
+                    label: Text(_isLoading ? '...' : 'Merge with existing deck'),
+                    style: OutlinedButton.styleFrom(
+                      padding: const EdgeInsets.symmetric(vertical: 16),
+                    ),
+                  ),
+                ),
+                const SizedBox(width: 12),
+                Expanded(
+                  child: FilledButton.icon(
+                    onPressed: _isLoading ? null : _importDeck,
+                    icon: _isLoading
+                        ? const SizedBox(
+                            width: 20,
+                            height: 20,
+                            child: CircularProgressIndicator(strokeWidth: 2),
+                          )
+                        : const Icon(Icons.add_circle_outline, size: 20),
+                    label: Text(_isLoading ? 'Importing...' : 'Import and create deck'),
+                    style: FilledButton.styleFrom(
+                      padding: const EdgeInsets.symmetric(vertical: 16),
+                    ),
+                  ),
+                ),
+              ],
             ),
 
             const SizedBox(height: 16),

lib/screens/flagged_questions_screen.dart

@@ -73,6 +73,68 @@ class _FlaggedQuestionsScreenState extends State<FlaggedQuestionsScreen> {
     showTopSnackBar(context, message: 'Question unflagged');
   }
 
+  void _removeQuestion(int index) {
+    if (_deck == null || index < 0 || index >= _editors.length) return;
+    final questionId = _editors[index].originalId;
+    if (questionId == null) return;
+    final updatedQuestions =
+        _deck!.questions.where((q) => q.id != questionId).toList();
+    final updatedDeck = _deck!.copyWith(questions: updatedQuestions);
+    _deckStorage.saveDeckSync(updatedDeck);
+    _editors[index].dispose();
+    setState(() {
+      _deck = updatedDeck;
+      _editors.removeAt(index);
+    });
+    showTopSnackBar(context, message: 'Question removed from deck');
+  }
+
+  Future<void> _removeAllQuestions() async {
+    if (_deck == null || _editors.isEmpty) return;
+    final count = _editors.length;
+    final confirmed = await showDialog<bool>(
+      context: context,
+      builder: (context) => AlertDialog(
+        title: const Text('Remove all flagged questions?'),
+        content: Text(
+          'Remove all $count flagged question${count == 1 ? '' : 's'} from the deck? This cannot be undone.',
+        ),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.pop(context, false),
+            child: const Text('Cancel'),
+          ),
+          FilledButton(
+            onPressed: () => Navigator.pop(context, true),
+            style: FilledButton.styleFrom(
+              backgroundColor: Theme.of(context).colorScheme.error,
+            ),
+            child: const Text('Remove all'),
+          ),
+        ],
+      ),
+    );
+    if (confirmed != true || !mounted) return;
+    final idsToRemove =
+        _editors.map((e) => e.originalId).whereType<String>().toSet();
+    final updatedQuestions =
+        _deck!.questions.where((q) => !idsToRemove.contains(q.id)).toList();
+    final updatedDeck = _deck!.copyWith(questions: updatedQuestions);
+    _deckStorage.saveDeckSync(updatedDeck);
+    for (final e in _editors) {
+      e.dispose();
+    }
+    setState(() {
+      _deck = updatedDeck;
+      _editors.clear();
+    });
+    showTopSnackBar(
+      context,
+      message: '$count question${count == 1 ? '' : 's'} removed from deck',
+      backgroundColor: Colors.green,
+    );
+  }
+
   void _save() {
     if (_deck == null) return;
     for (int i = 0; i < _editors.length; i++) {
@@ -162,6 +224,11 @@ class _FlaggedQuestionsScreenState extends State<FlaggedQuestionsScreen> {
         title: Text('Flagged questions (${_editors.length})'),
         actions: [
           if (hasEditors) ...[
+            IconButton(
+              onPressed: _removeAllQuestions,
+              icon: const Icon(Icons.delete_forever),
+              tooltip: 'Remove all from deck',
+            ),
             IconButton(
               onPressed: _save,
               icon: const Icon(Icons.save),
@@ -216,7 +283,7 @@ class _FlaggedQuestionsScreenState extends State<FlaggedQuestionsScreen> {
                       key: ValueKey('flagged_${_editors[index].originalId}_$index'),
                       editor: _editors[index],
                       questionNumber: index + 1,
-                      onDelete: null,
+                      onDelete: () => _removeQuestion(index),
                       onUnflag: () => _unflag(index),
                       onChanged: () => setState(() {}),
                     );