fix(desktop): recover from macOS directory permission failures

packages/ui/src/lib/desktop.ts

@@ -531,6 +531,10 @@ export const isDesktopShell = (): boolean => {
   return isElectronShell();
 };
 
+export const canRequestNativeDirectoryAccess = (): boolean => (
+  isDesktopShell() && hasDesktopInvoke() && isDesktopLocalOriginActive()
+);
+
 export const startDesktopWindowDrag = async (): Promise<boolean> => {
   if (!isDesktopShell()) {
     return false;
@@ -586,12 +590,13 @@ export const requestDirectoryAccess = async (
   directoryPath: string
 ): Promise<{ success: boolean; path?: string; projectId?: string; error?: string }> => {
   // Desktop shell on local instance: use native folder picker.
-  if (hasDesktopInvoke() && isDesktopLocalOriginActive()) {
+  if (canRequestNativeDirectoryAccess()) {
     try {
       const selected = await getDesktopBridge()?.openDialog?.({
         directory: true,
         multiple: false,
         title: 'Select Working Directory',
+        ...(directoryPath ? { defaultPath: directoryPath } : {}),
       });
       if (!selected || typeof selected !== 'string') {
         return { success: false, error: 'Directory selection cancelled' };
@@ -603,7 +608,7 @@ export const requestDirectoryAccess = async (
     }
   }
 
-  return { success: true, path: directoryPath };
+  return { success: false, error: 'Native directory picker not available' };
 };
 
 const isDesktopFileGrantResult = (