docs(spec): network attention display review round 1
- Simplify 'missed' detail text to static 'Your network missed this'
(attentionInverse is always 1.0 for missed state, so percentage is
always 100% and adds no information).
- Use percentage for 'engaged' state instead: 'X% of your network
missed this' — the gradient IS meaningful there.
- Add className='h-full' to LumeCard in code snippet.
- Add note to copy card content JSX from existing page.tsx.
- Fix prose contradiction about unauthenticated fetch behavior.