The matrix mounted every badge's tooltip up front, hidden by CSS, and
re-rendered every row on each keystroke. Tooltips now mount while their
badge is hovered or has keyboard focus, are named by aria-describedby
and close on Escape. Badges and rows are memoized, each row's search
text is built once, the filter makes one pass for its rows and its
count, and the table follows deferred search and status values, with
expand all and collapse all as transitions, so input stays responsive.
The tree and filter passes move to src/lib/compatibility-tree.ts, with
unit tests that also render the badges on the server (pnpm test:unit,
part of pnpm check).
Closes#601
Co-authored-by: jonbaldie <8376953+jonbaldie@users.noreply.github.com>
