PR #428 added a General Settings zoom slider after the desktop shortcut work already introduced a native-first app zoom controller. Keeping both paths would create double scaling and stale UI state, so the slider now routes through the existing controller and store state while the app shell no longer applies a second CSS zoom.
Constraint: UI zoom is device-local display state and should not be written into shared user settings.
Rejected: Keep cc-haha-ui-zoom plus AppShell style.zoom | it conflicts with shortcut zoom and multiplies visual scale.
Rejected: Persist zoom through /api/settings/user | it would sync display-specific state across machines.
Confidence: high
Scope-risk: moderate
Directive: Keep app zoom behind desktop/src/lib/appZoom.ts; do not add another storage key or DOM zoom application point without migration and shortcut sync tests.
Tested: cd desktop && bun run test -- --run src/lib/appZoom.test.ts src/hooks/useKeyboardShortcuts.test.tsx src/stores/settingsStore.test.ts src/__tests__/generalSettings.test.tsx src/lib/persistenceMigrations.test.ts src/lib/doctorRepair.test.ts
Tested: bun run check:desktop
Not-tested: Real Windows/Linux desktop runtime smoke.
The desktop shell needed predictable zoom controls across macOS,
Windows, and Linux without depending on browser defaults. This adds a
small app zoom controller that persists a bounded zoom factor, maps the
IDE-style primary-modifier shortcuts, and uses native Tauri webview zoom
when available with a browser fallback for H5/dev runs.
Constraint: Issue #407 requested IDE-style zoom shortcuts across macOS, Windows, and Linux
Rejected: Enable Tauri built-in zoom hotkeys only | it would not cover browser/H5 fallback or app-owned persistence consistently
Confidence: high
Scope-risk: narrow
Directive: Keep app zoom bounded and validated before applying persisted localStorage values
Tested: bun run verify; browser smoke on http://127.0.0.1:45679/ with Meta+= and Meta+0
Not-tested: Manual Windows/Linux desktop runtime smoke
The pure white appearance option needed to avoid warm-theme leakage while preserving the existing warm classic brand theme. This adds the white theme mode, keeps local browser startup from reusing stale H5 server URLs in dev, and moves visible legacy warm surfaces onto theme tokens.
Constraint: H5 server auth policy, CORS policy, SDK routes, adapter routes, and IM access paths must not change for a visual theme fix
Rejected: Rename the original light theme to pure white | the original theme is a warm classic palette, not a neutral white workspace
Confidence: high
Scope-risk: moderate
Directive: Keep structural white-theme borders neutral; reserve the warm brand color for selected states, primary actions, and small accents
Tested: cd desktop && bun run test -- src/__tests__/generalSettings.test.tsx src/lib/desktopRuntime.test.ts src/lib/persistenceMigrations.test.ts src/stores/uiStore.test.ts src/stores/settingsStore.test.ts
Tested: cd desktop && bun run lint
Tested: cd desktop && bun run build
Tested: bun test src/server/__tests__/settings.test.ts src/server/__tests__/h5-access-policy.test.ts src/server/__tests__/h5-access-auth.test.ts src/server/middleware/cors.test.ts
Tested: Browser smoke at http://127.0.0.1:5173 with data-theme=white, no H5 token prompt, /status inspector visible, inspector border #DDE3EA
Not-tested: Full bun run verify gate
Online upgrades can strand users on stale desktop UI state or malformed local persistence. This adds a deny-by-default Doctor path that resets only regenerable desktop UI state, reports protected local files with redacted metadata, and keeps protected repair as a dry-run no-op until a reviewed backup-first flow exists.
Constraint: Chat transcripts, model/provider config, Skills, MCP, IM bindings, adapter sessions, OAuth tokens, plugins, and team/session records are user-owned protected state.
Rejected: Automatically rewrite malformed protected JSON | unsafe without schema-specific migrations and backups.
Rejected: Continue relying only on startup migrations | users need an explicit recovery action after a white screen.
Confidence: high
Scope-risk: moderate
Directive: Keep Doctor repair deny-by-default; do not mutate protected state without an explicit reviewed backup-first manual repair flow.
Tested: bun test src/server/__tests__/doctor-service.test.ts
Tested: cd desktop && bun run test src/components/ErrorBoundary.test.tsx src/lib/doctorRepair.test.ts src/__tests__/diagnosticsSettings.test.tsx src/components/layout/StartupErrorView.test.tsx
Tested: cd desktop && bun run lint
Tested: bun run check:server
Tested: bun run verify (failed only existing agent-utils coverage baseline; changed-lines coverage 97.62%)
Not-tested: Packaged desktop manual Doctor click path.
Desktop users can carry provider indexes, managed settings, localStorage state, and native update state from builds that no longer match current readers. This adds startup migrations and recovery paths before server and React state are consumed, plus a persistence upgrade gate so future storage protocol changes ship with old-format fixtures.
Constraint: Existing installs may contain malformed or legacy JSON/localStorage that must not block startup.
Constraint: Local verify should evaluate the current worktree diff rather than unrelated detached-worktree history.
Rejected: Treat invalid persisted state as fatal | reproduces white-screen and startup failure behavior for existing users.
Rejected: Bypass PR policy locally | hides real gate behavior and does not fix detached-worktree false positives.
Confidence: high
Scope-risk: moderate
Directive: Any local JSON, localStorage, or app config shape change must add a migration fixture and keep `bun run check:persistence-upgrade` green.
Tested: bun run check:persistence-upgrade; bun run check:policy; bun run check:desktop; bun run check:server; bun run check:native; bun run verify (9 passed, 1 coverage baseline failure)
Not-tested: Live provider baseline; existing user configs beyond covered fixtures
