fix: two-row header layout, flexible path input, button error handling

- Split header into two rows: breadcrumb + count on top, path/buttons below
- Path input is now flexible (fills available width) instead of fixed 320px
- Fixes Row overflow on narrow windows
- Load/Browse buttons now same height (36px) as path input
- Added try/catch with snackbar error feedback for Load and Browse
- Removed initialDirectory from file picker (could fail in non-sandbox)
- Browse also updates the path input field when a folder is selected
- Signed, notarized, stapled DMG

lib/screens/home/home_screen.dart

@@ -332,12 +332,25 @@ class _HomeScreenState extends State<HomeScreen> {
   }
 
   Future<void> _pickFolder() async {
+    try {
       final result = await FilePicker.platform.getDirectoryPath(
         dialogTitle: 'Select a folder containing Claude session files',
       );
       if (result != null) {
+        _pathController.text = result;
         await _scanFolder(result);
       }
+    } catch (e) {
+      debugPrint('[Browse] Error: $e');
+      if (mounted) {
+        ScaffoldMessenger.of(context).showSnackBar(
+          SnackBar(
+            content: Text('Could not open folder picker: $e'),
+            backgroundColor: AppColors.error,
+          ),
+        );
+      }
+    }
   }
 
   Future<void> _scanFolder(String folderPath) async {
@@ -393,15 +406,25 @@ class _HomeScreenState extends State<HomeScreen> {
   }
 
   Future<void> _loadSingleFile() async {
-    final home = _getRealHome() ?? '';
+    try {
       final result = await FilePicker.platform.pickFiles(
         type: FileType.custom,
         allowedExtensions: ['jsonl'],
-      initialDirectory: '$home/.claude/projects',
       );
       if (result != null && result.files.single.path != null) {
         await _loadFile(result.files.single.path!);
       }
+    } catch (e) {
+      debugPrint('[Load] Error: $e');
+      if (mounted) {
+        ScaffoldMessenger.of(context).showSnackBar(
+          SnackBar(
+            content: Text('Could not open file picker: $e'),
+            backgroundColor: AppColors.error,
+          ),
+        );
+      }
+    }
   }
 
   Future<void> _loadFile(String path) async {
@@ -491,11 +514,13 @@ class _HomeScreenState extends State<HomeScreen> {
   // ─── Header with breadcrumb ──────────────────────────────
 
   Widget _buildHeader(SessionProvider provider) {
-    return Row(
+    return Column(
+      children: [
+        // Row 1: breadcrumb + count
+        Row(
           children: [
             const Icon(Icons.terminal, size: 24, color: AppColors.assistant),
             const SizedBox(width: 10),
-        // Breadcrumb
             InkWell(
               onTap: () => setState(() => _selectedProject = null),
               borderRadius: BorderRadius.circular(4),
@@ -538,9 +563,16 @@ class _HomeScreenState extends State<HomeScreen> {
                   : '${_projects.length} projects',
               style: const TextStyle(fontSize: 12, color: AppColors.textMuted),
             ),
-        // Path input field
+          ],
-        SizedBox(
+        ),
-          width: 320,
+        const SizedBox(height: 12),
+        // Row 2: path input + Load + Browse
+        Row(
+          children: [
+            // Path input field — flexible to fill available space
+            Expanded(
+              child: SizedBox(
+                height: 36,
                 child: TextField(
                   controller: _pathController,
                   focusNode: _pathFocusNode,
@@ -585,15 +617,20 @@ class _HomeScreenState extends State<HomeScreen> {
                   onSubmitted: (_) => _scanFromPathInput(),
                 ),
               ),
+            ),
             const SizedBox(width: 8),
-        ElevatedButton.icon(
+            SizedBox(
+              height: 36,
+              child: ElevatedButton.icon(
                 onPressed: _loadSingleFile,
                 icon: const Icon(Icons.insert_drive_file_outlined, size: 14),
                 label: const Text('Load'),
                 style: ElevatedButton.styleFrom(
                   backgroundColor: AppColors.surfaceLight,
                   foregroundColor: AppColors.textPrimary,
-            padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 8),
+                  padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 0),
+                  minimumSize: Size.zero,
+                  tapTargetSize: MaterialTapTargetSize.shrinkWrap,
                   shape: RoundedRectangleBorder(
                     borderRadius: BorderRadius.circular(6),
                     side: const BorderSide(color: AppColors.surfaceBorder),
@@ -601,15 +638,20 @@ class _HomeScreenState extends State<HomeScreen> {
                   textStyle: const TextStyle(fontSize: 12),
                 ),
               ),
+            ),
             const SizedBox(width: 8),
-        ElevatedButton.icon(
+            SizedBox(
+              height: 36,
+              child: ElevatedButton.icon(
                 onPressed: _pickFolder,
                 icon: const Icon(Icons.folder_open, size: 14),
                 label: const Text('Browse'),
                 style: ElevatedButton.styleFrom(
                   backgroundColor: AppColors.surfaceLight,
                   foregroundColor: AppColors.textPrimary,
-            padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 8),
+                  padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 0),
+                  minimumSize: Size.zero,
+                  tapTargetSize: MaterialTapTargetSize.shrinkWrap,
                   shape: RoundedRectangleBorder(
                     borderRadius: BorderRadius.circular(6),
                     side: const BorderSide(color: AppColors.surfaceBorder),
@@ -617,6 +659,9 @@ class _HomeScreenState extends State<HomeScreen> {
                   textStyle: const TextStyle(fontSize: 12),
                 ),
               ),
+            ),
+          ],
+        ),
       ],
     );
   }