HACS presentation fix.
- Updated README logo, preview, and screenshot links to absolute GitHub raw URLs so they render inside the HACS download screen.
- Bumped the package/card version to 5.1.1 and rebuilt dist.
Verification:
- npm run build
- npm run lint (warnings only)
- npm test: 60 passed
- node --check src/homeii-music-flow.js
- node --check dist/homeii-music-flow.js
- README raw image URLs return HTTP 200