fix: per session working dir isolation (#6920)

ui/desktop/src/components/bottom_menu/DirSwitcher.tsx

@@ -3,7 +3,6 @@ import { FolderDot } from 'lucide-react';
 import { Tooltip, TooltipContent, TooltipProvider, TooltipTrigger } from '../ui/Tooltip';
 import { updateWorkingDir } from '../../api';
 import { toast } from 'react-toastify';
-import { setCurrentWorkingDir } from '../../utils/workingDir';
 
 interface DirSwitcherProps {
   className: string;
@@ -43,7 +42,6 @@ export const DirSwitcher: React.FC<DirSwitcherProps> = ({
     const newDir = result.filePaths[0];
 
     window.electron.addRecentDir(newDir);
-    setCurrentWorkingDir(newDir);
 
     if (sessionId) {
       onWorkingDirChange?.(newDir);

ui/desktop/src/utils/workingDir.ts

@@ -1,11 +1,4 @@
-// Track the current working dir for this window (updated when user changes it)
-let currentWorkingDir: string | null = null;
-
-export const setCurrentWorkingDir = (dir: string): void => {
-  currentWorkingDir = dir;
-};
-
 export const getInitialWorkingDir = (): string => {
-  // Use the current dir if set, otherwise fall back to initial config
-  return currentWorkingDir ?? (window.appConfig?.get('GOOSE_WORKING_DIR') as string) ?? '';
+  // Fall back to initial config from app startup
+  return (window.appConfig?.get('GOOSE_WORKING_DIR') as string) ?? '';
 };