fix: invalidate project tasks on return from task edit screen

lib/screens/library/project_tasks_screen.dart

@@ -48,6 +48,12 @@ class _ProjectTasksScreenState extends ConsumerState<ProjectTasksScreen> {
     }
   }
 
+  void _openTask(int taskId) {
+    context
+        .push(Routes.taskEdit.replaceFirst(':id', '$taskId'))
+        .then((_) => ref.invalidate(projectTasksProvider(widget.projectId)));
+  }
+
   Color _parseColor(String? hex) {
     if (hex == null || hex.isEmpty) return const Color(0xFF6366F1);
     try {
@@ -171,6 +177,7 @@ class _ProjectTasksScreenState extends ConsumerState<ProjectTasksScreen> {
                     task: task,
                     effectiveStatus: _effectiveStatus(task),
                     onStatusTap: () => _cycleStatus(task),
+                    onTap: () => _openTask(task.id),
                   );
                 },
               ),
@@ -198,6 +205,7 @@ class _ProjectTasksScreenState extends ConsumerState<ProjectTasksScreen> {
                   task: task,
                   effectiveStatus: _effectiveStatus(task),
                   onStatusTap: () => _cycleStatus(task),
+                  onTap: () => _openTask(task.id),
                 );
               },
             ),
@@ -282,11 +290,13 @@ class _TaskRow extends StatelessWidget {
   final Task task;
   final TaskStatus effectiveStatus;
   final VoidCallback onStatusTap;
+  final VoidCallback onTap;
 
   const _TaskRow({
     required this.task,
     required this.effectiveStatus,
     required this.onStatusTap,
+    required this.onTap,
   });
 
   IconData get _statusIcon => switch (effectiveStatus) {
@@ -317,8 +327,7 @@ class _TaskRow extends StatelessWidget {
     return Card(
       margin: const EdgeInsets.symmetric(horizontal: 12, vertical: 3),
       child: InkWell(
-        onTap: () => context
-            .push(Routes.taskEdit.replaceFirst(':id', '${task.id}')),
+        onTap: onTap,
         borderRadius: BorderRadius.circular(14),
         child: Padding(
           padding: const EdgeInsets.fromLTRB(4, 6, 14, 6),