- Add /settings page with password change form and personas list
- Add /help dedicated page (replaces help modal); renders HELP.md with
collapsible sections, dark theme, back link to active persona
- Add 👤 account button and convert ? button to link in header
- Remove help modal HTML and ~55 lines of modal JS from main app
- Register settings and help routers in main.py
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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