/explore's rows and filters draw §5's .row and .filters #4629

/explore now draws each result with §5's row() and the filter bar with .filters, and no explore-* class is left in its markup. bun test passes on explore, name-marks and design-lint, and bun scripts/design-lint.ts is clean. I didn't run the whole suite. bun x tsc --noEmit couldn't run here ("Cannot find type definition file for 'bun'"), so the type check is unverified. I haven't looked at the page by eye, so the "looks the same" box isn't ticked.

What changed

• Rows: the name link and owner mark sit in the row title. The description and the numbers form one ·-joined meta line. "Make it yours" is the trail. The code is in src/web/studio/explore.ts.
• Styles: I removed the .explore-* rules from src/web/style/content.ts and struck them from the §5d list in docs/DESIGN.md. The search box now uses the existing .bar .search rule.
• Tests: a new test in test/explore.test.ts fetches /explore and asserts class="row", row-title, filters mb, and no explore-. I changed one regex in test/name-marks.test.ts that matched the old <li class="row explore-row">; that test was tied to the old markup.

What looks different

• Description and numbers: they share one truncated line instead of two. This is the thing to check by eye.
• Search box: it is capped at 320px instead of filling the width.
• Phone layout: the sideways-scrolling chip row with the fade and the stacked "Make it yours" button are gone. Chips now use the shared .filters .seg overflow behaviour.

I left docs/design/baseline.json alone: it has no counts to lower.

Closes #4583

/explore now draws each result with §5's row() and the filter bar with .filters, and no explore-* class is left in its markup. bun test passes on explore, name-marks and design-lint, and bun scripts/design-lint.ts is clean. I didn't run the whole suite. bun x tsc --noEmit couldn't run here ("Cannot find type definition file for 'bun'"), so the type check is unverified. I haven't looked at the page by eye, so the "looks the same" box isn't ticked.

What changed

• Rows: the name link and owner mark sit in the row title. The description and the numbers form one ·-joined meta line. "Make it yours" is the trail. The code is in src/web/studio/explore.ts.
• Styles: I removed the .explore-* rules from src/web/style/content.ts and struck them from the §5d list in docs/DESIGN.md. The search box now uses the existing .bar .search rule.
• Tests: a new test in test/explore.test.ts fetches /explore and asserts class="row", row-title, filters mb, and no explore-. I changed one regex in test/name-marks.test.ts that matched the old <li class="row explore-row">; that test was tied to the old markup.

What looks different

• Description and numbers: they share one truncated line instead of two. This is the thing to check by eye.
• Search box: it is capped at 320px instead of filling the width.
• Phone layout: the sideways-scrolling chip row with the fade and the stacked "Make it yours" button are gone. Chips now use the shared .filters .seg overflow behaviour.

I left docs/design/baseline.json alone: it has no counts to lower.

/explore now draws each result with §5's row() and the filter bar with .filters, and no explore-* class is left in its markup. The type error that failed the check is fixed and pushed. I haven't seen the forge's re-run of the check on this push.

The fix: rowHtml in src/web/studio/explore.ts was passing meta and trail as undefined. The repo's exactOptionalPropertyTypes setting rejects that. It now leaves those keys out when there is nothing to show. tsc --noEmit is clean here, and the explore and name-marks tests pass.

What changed

• Rows: the name link and owner mark sit in the row title. The description and numbers form one ·-joined meta line. "Make it yours" is the trail.
• Styles: the .explore-* rules are gone from src/web/style/content.ts and struck from the §5d list in docs/DESIGN.md. The search box uses the existing .bar .search rule. bun scripts/design-lint.ts was clean before this fix, and docs/design/baseline.json has no counts to lower.
• Tests: a new test in test/explore.test.ts fetches /explore and asserts the §5 classes and no explore-. I changed one regex in test/name-marks.test.ts because it matched the old <li class="row explore-row">.

What looks different (not checked by eye)

• The description and numbers share one truncated line instead of two.
• The search box is capped at 320px instead of filling the width.
• The phone layout's sideways-scrolling chip row with the fade, and the stacked "Make it yours" button, are gone. Chips now use the shared .filters .seg overflow behaviour.