Add a skippable first-use Setup Center that guides users through three
prerequisites: Claude Code CLI detection, API provider configuration,
and default project directory selection. Replace passive fail-then-hint
patterns with proactive guidance and actionable error recovery.
Setup Center (13 new files):
- SetupCenter overlay with 4 cards (Welcome, ClaudeCode, Provider, ProjectDir)
- Auto-close only when user completes last card in current session
- Re-openable from Settings > General > "首次设置引导"
- Claude Code conflict detection with per-install-type uninstall commands
- Provider detection covers DB providers, env vars, and legacy app-settings token
- ANTHROPIC_BASE_URL excluded from credential check (not a real credential)
- skipped != completed: /chat still prompts for provider after skip
Project directory:
- Validation via /api/files/browse before trusting saved paths
- Fallback chain: localStorage → setup_default_project → empty state
- Cross-component sync via project-directory-changed CustomEvent
Toast system:
- Global showToast() API with success/error/warning/info types
- FIFO eviction (max 3), action button support
Git panel:
- Move Commit + Push buttons from UnifiedTopBar into GitStatusSection
- Push enabled for new branches (backend auto-handles -u origin)
Other:
- Windows top-bar safe zone (138px spacer for caption buttons)
- Cross-platform path splitting with /[\\/]/ regex
- Platform-aware file manager name (Finder/Explorer/Files)
- ~80 new i18n keys (en + zh)
- Handover doc: docs/handover/onboarding-setup-center.md
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
