Redesign UI with modern dark theme and improved styling

- Unified color scheme using CSS variables across all pages
- Fixed spacing issues in verse display (removed <br> joins for rich view)
- Updated all HTML pages with proper HTML5 structure
- Added responsive design with mobile breakpoints
- Created shared stylesheet (styles/page.css) for form pages
- Fixed unclosed div tag in scripture_response
- Improved typography with serif fonts for scripture text
- Added verse container cards with hover effects
- Inline dark background to prevent white flash on navigation

All endpoints remain backward compatible with existing functionality.

html/response.html

@@ -1 +1,4 @@
-<b><a href="/find?kw={chapter}&view=rich">{passage}</a></b><br>{text}<br>
+<div class="verse-container">
+<div class="verse-reference"><a href="/find?kw={chapter}&view=rich">{passage}</a></div>
+<div class="verse-text">{text}</div>
+</div>