fix: auto-prompt when directory is invalid

Instead of showing an error when the directory path is invalid,
now automatically clears the path and shows the prompt again.

This creates a seamless recovery flow:
- User selects invalid directory → Path cleared → Prompt shown again
- User can immediately choose correct directory or clone

Much better UX than just showing an error and making them manually
clear the directory.

Author: lucasheriques

src/renderer/features/task-detail/stores/taskExecutionStore.ts

@@ -582,14 +582,11 @@ export const useTaskExecutionStore = create<TaskExecutionStore>()(
         );
 
         if (!isValid) {
-          // Repository doesn't exist - user should use the prompt to select/clone
-          store.addLog(taskId, {
-            type: "error",
-            ts: Date.now(),
-            message:
-              "Repository path is not valid. Please select a valid directory or clone the repository.",
-          });
-          return;
+          // Repository path is invalid - clear it and show the prompt again
+          store.setRepoPath(taskId, null);
+
+          // Recursively call runTask to trigger the prompt flow
+          return store.runTask(taskId, task);
         }
 
         const permissionMode = "acceptEdits";