- routes.ts: use isAbsolute() before resolve() for proper path validation
- routes.ts: wrap mkdir() in try/catch to map EEXIST/ENOENT/ENOTDIR to 4xx
- DirectoryPicker.tsx: use !browser.currentPath guard to prevent re-fetch loop
- DirectoryPicker.tsx: disable Create button during in-flight requests
- DirectoryPicker.tsx: add fetchEntries to useEffect dependency array
- DirectoryPicker.tsx: client-side validation for folder names
- Add changeset for the new create-folder feature
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