Sidebar project ordering, pinning, and hidden-project state must survive
browser access to the same local server, so the UI now stores these
preferences under the cc-haha config directory and keeps localStorage as
a migration/cache fallback.
Constraint: Browser and H5 localStorage is isolated from the Tauri WebView
Rejected: Keep sidebar project preferences only in localStorage | browser sessions would not share state
Rejected: Reuse cc-haha/settings.json | provider and H5 access settings should stay separate
Confidence: high
Scope-risk: moderate
Directive: Keep sidebar hide/remove semantics non-destructive; do not delete transcript files for project removal
Tested: cd desktop && bun run test -- src/components/layout/Sidebar.test.tsx --run
Tested: cd desktop && bun run lint
Tested: bun test src/server/__tests__/desktop-ui-preferences.test.ts
Tested: bun run check:persistence-upgrade
Tested: bun run check:server
