Interactivity & Link Checker

Check all Screen_*.html files for FULL INTERACTIVITY:

**Navigation:**
1. List every href in each file
2. Verify target file exists
3. Check for broken links
4. Verify user flows completable end-to-end

**Interactions:**
5. Chat interfaces have mocked responses (typing indicator, simulated replies)
6. Forms have JavaScript for validation, loading, success/error states
7. Dropdowns have onclick/onchange handlers
8. Modals have open/close functionality
9. Data tables have sort/filter/paginate handlers (if applicable)

Report broken links AND missing interactions. Prototype must be FULLY CLICKABLE.