Add separate UI Lab scenarios for true first-run onboarding and post-update What's New checks. Keep empty-library fixtures reusable across mock data, tagger readiness, worker pause defaults, and launch-time version state so browser verification can exercise the real flows.
Add UI Lab scenarios for uninstalled WD and JoyTag tagger states so the lightbox and AI Workspace readiness flows can be exercised directly.
Make the Settings title-bar button accessible by label to support reliable UI Lab automation.
Add an extreme UI Lab scenario with virtual-scale library, album, cluster, and tag counts while keeping the rendered media fixture set manageable.
Return the full extreme tag set from the mock backend so tag manager layouts can be stress-tested with 10k-100k tag counts.
Add a dev-only Vite UI mode with Tauri API mocks, in-memory fixture scenarios, reusable media source handling, and documentation for browser-based visual testing.