- Register service worker (`sw.js`) with cache-first static assets and network-first HTML pages
- Update `site.webmanifest` with app name, colors, icons at `/static/`, and standalone display mode
- Add `<meta name="theme-color">` in layout for browser UI theming
- Simplify creativity slider: change range from 0–10 to 3.0–7.0 (step 0.5), aligning frontend and backend logic
- Adjust `generate.js` route and `generation.js` service to accept direct temperature values (3.0–7.0) instead of scaled inputs
