Each line of a repository's waves list says the wave's date: `0.7.12 · 2026-10-20 · headline · 4 pulls` #6478

The waves list says the version, the headline and the pull count, but not when the wave was cut, which is what a reader of the story wants first.

Done:

• [ ] waveLine in src/web/pages/waves.ts puts the wave's date (already parsed into Wave.date by src/story/wave.ts) after the version. The terminal's list in src/tui/screens/waves.ts shows the same date in the same place.
• [ ] test/waves-line-date.test.ts checks waveLine for one wave and the page for a repository with two waves, newest first, each with its date.

Files: src/web/pages/waves.ts, src/tui/screens/waves.ts, test/waves-line-date.test.ts