Standalone mode (VITE_STANDALONE=true) skipped the designs system entirely:
the design list stayed empty (switcher hidden) and all canvases collapsed onto
a single localStorage key. Add a localStorage-backed design layer mirroring the
backend designs API.
- standaloneStorage util: list/create/update/delete designs + per-design canvas
storage (homelable_designs + homelable_canvas:<id>). ensureSeed migrates a
legacy single-canvas install into a default design so existing data survives.
- App.tsx: load/seed designs, save + switch canvases per design id in standalone.
- Sidebar.tsx: create/update/delete dispatch to standaloneStorage when standalone.
- Tests for the new storage util.
ha-relevant: no
Pouzor
ca171089c2