feat(delete): enhance branch deletion handling and validation

- Introduced a flag to track if a branch was successfully deleted, improving response clarity.
- Updated the response structure to include the new branchDeleted flag.
- Enhanced projectPath validation in init-script to ensure it is a non-empty string before processing.

apps/server/src/routes/worktree/routes/delete.ts

@@ -57,6 +57,7 @@ export function createDeleteHandler() {
       }
 
       // Optionally delete the branch
+      let branchDeleted = false;
       if (deleteBranch && branchName && branchName !== 'main' && branchName !== 'master') {
         // Validate branch name to prevent command injection
         if (!isValidBranchName(branchName)) {
@@ -64,8 +65,10 @@ export function createDeleteHandler() {
         } else {
           try {
             await execGitCommand(['branch', '-D', branchName], projectPath);
+            branchDeleted = true;
           } catch {
             // Branch deletion failed, not critical
+            logger.warn(`Failed to delete branch: ${branchName}`);
           }
         }
       }
@@ -74,7 +77,8 @@ export function createDeleteHandler() {
         success: true,
         deleted: {
           worktreePath,
-          branch: deleteBranch ? branchName : null,
+          branch: branchDeleted ? branchName : null,
+          branchDeleted,
         },
       });
     } catch (error) {

apps/server/src/routes/worktree/routes/init-script.ts

@@ -36,9 +36,10 @@ function getInitScriptPath(projectPath: string): string {
 export function createGetInitScriptHandler() {
   return async (req: Request, res: Response): Promise<void> => {
     try {
-      const projectPath = req.query.projectPath as string;
+      const rawProjectPath = req.query.projectPath;
 
-      if (!projectPath) {
+      // Validate projectPath is a non-empty string (not an array or undefined)
+      if (!rawProjectPath || typeof rawProjectPath !== 'string') {
         res.status(400).json({
           success: false,
           error: 'projectPath query parameter is required',
@@ -46,6 +47,15 @@ export function createGetInitScriptHandler() {
         return;
       }
 
+      const projectPath = rawProjectPath.trim();
+      if (!projectPath) {
+        res.status(400).json({
+          success: false,
+          error: 'projectPath cannot be empty',
+        });
+        return;
+      }
+
       const scriptPath = getInitScriptPath(projectPath);
 
       try {

apps/ui/src/components/views/board-view/dialogs/backlog-plan-dialog.tsx

@@ -63,7 +63,7 @@ interface BacklogPlanDialogProps {
   setPendingPlanResult: (result: BacklogPlanResult | null) => void;
   isGeneratingPlan: boolean;
   setIsGeneratingPlan: (generating: boolean) => void;
-  // Branch to use for created features (defaults to main if not provided)
+  // Branch to use for created features (defaults to 'main' when applying)
   currentBranch?: string;
 }
 
@@ -170,7 +170,11 @@ export function BacklogPlanDialog({
         }) || [],
     };
 
-    const result = await api.backlogPlan.apply(projectPath, filteredPlanResult, currentBranch);
+    const result = await api.backlogPlan.apply(
+      projectPath,
+      filteredPlanResult,
+      currentBranch ?? 'main'
+    );
     if (result.success) {
       toast.success(`Applied ${result.appliedChanges?.length || 0} changes`);
       setPendingPlanResult(null);