Split SkillSaveContext and useSkillSaveManager into a separate file to
fix react-refresh/only-export-components lint error. Destructure
mutateAsync from useUpdateAppAssetFileContent for a stable callback
reference, preventing unnecessary useCallback cascade rebuilds. Extract
shared patchFileContentCache helper to unify setQueryData logic between
updateCachedContent and the collaboration event handler.
Use useRef to store saveFile reference and remove it from useEffect
dependencies to prevent cleanup from re-triggering on reference changes.
Also normalize metadata before comparison when clearing dirty state to
ensure filtered tools match correctly.
Cover Ctrl+S and Cmd+S save triggers, guard clauses for start tab and
null active tab, success/error toast notifications, and fallback
registry integration.
- use cleanup-based save on tab switch with stable fallback snapshots
- add fallback registry for metadata-only autosave consistency
- add autosave/save-manager tests
