fix: per session working dir isolation (#6920)

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) ?? '';
 };