feat(help): in-app role-based help guides + screenshot capture pipeline
- Help.tsx: role tabs, TOC scroll-spy, search, lightbox, react-markdown renderer
- 7 markdown guides (global, client, linguist, reviewer, production, PM, admin)
with explicit click/drag/keyboard annotations throughout
- Sidebar: Help button added at bottom of nav (all roles)
- App.tsx: /help route, no RoleGate
- frontend/public/help-screenshots/{role}/: directories ready for screenshots
- tools/capture-help-screenshots.ts: Playwright screenshot script
- Clicks "Local login" toggle before filling credentials
- Uses test-admin local account (not SSO)
- backend/scripts/seed_test_users.py: idempotent MongoDB seed script
creates 6 local-auth users (admin + 5 roles) for capture + local dev
- .env.screenshots.example: template with test-admin credentials
- Removes docs/video_accessibility_user_guide_v3.md (superseded by in-app guides)
- Deps: react-markdown, remark-gfm, rehype-raw added to frontend
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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