- Add timezone select dropdown to profile form with common US
timezones and UTC
- Add system default timezone setting to admin settings page
- Reformat profile_form.templ with consistent indentation and
multi-line attribute formatting
- Remove wood-light, wood-dark, wood-mahogany from theme dropdown
- Wood paneling is now browser-only (localStorage preference)
- Users select wood paneling from header dropdown, not profile
- Profile form only controls server-synced color themes
Add admin_users.templ for user management interface with delete, password
reset, and edit capabilities. Add profile.templ and related components for
user profile management. Remove admin_profile.templ. Update all templates
to use new consolidated API endpoints.