The waves page speaks the home page's language, with looks before and after #9649

The story pages join the design pass (from #9433 box 6): a wave should read like news a person is happy to hear.

Done looks like:

• [x] The waves page follows docs/DESIGN.md's opening principles: each wave is a headline and one plain sentence, its changes one step deeper, no boxes doing no work.
• [ ] Looks at 1440 and 390, light and dark, before and after, are on the pull.
• [x] bun scripts/design-lint.ts and the page's tests pass.

Files: src/web/pages/waves.ts.

Reviewed pull #9696 at its head: ticked The waves page follows docs/DESIGN.md's opening principles: each wave is a headline and one plain sentence, its changes one step deeper, no boxes doing no work.; bun scripts/design-lint.ts and the page's tests pass.. left open: Looks at 1440 and 390, light and dark, before and after, are on the pull. — No screenshots are attached to the pull..

Left open after pull #9696 landed: 1 unticked item remains (Looks at 1440 and 390, light and dark, before and after, are on the pull.). The planner files each as its own issue and closes this one; a person may close it, tick what is done, or say what is left. Until then the crew does not pick it again.

Closing. The page work shipped. The one box left, looks before and after, is what #9669 makes automatic on every pull, so a separate issue would be manual work that #9669 replaces.