fix: rebuilt stylesheet + visible explorer rows (v3.6.30)

The compiled Tailwind stylesheet (frontend/style.css) had been stale since
2026-09-22: classes introduced later were missing from it, so the Install /
Make selectable chips had no background or text colour in light mode (dark
mode only looked green because an older dark:text-emerald-400 rule matched)
and the new w-28 action column did not apply.

- Rebuilt with `npm run build` (Tailwind + appended src/contrast.css);
  verified the previously missing classes (bg-emerald-100, text-emerald-700,
  hover:bg-emerald-200, bg-red-100, bg-blue-100, w-28, ...).
- Explorer rows are visible chips now: rounded bg-gray-50 dark:bg-slate-800/60
  with a hover:bg-gray-100 highlight and the colored left accent kept (module
  rows a subtler variant), so a right-column button is unambiguously tied to
  its row; ISD/app/ELF/module rows all use the same treatment.
- AGENTS working conventions: an index.html change that introduces new
  utility classes also requires `npm run build` in frontend/.

660 frontend / 504 Python green; version 3.6.30; sw simple-v303.

frontend/tests/ram.test.js

@@ -203,6 +203,9 @@ test('explorer action buttons share a fixed-width column, Install is green', ()
 	delete global.t;
 	// every action cell is the same fixed-width column
 	assert.ok(out.includes('w-28 shrink-0'), out);
+	// rows are visible chips (background + hover) so the button belongs to its row
+	assert.ok(out.includes('bg-gray-50 dark:bg-slate-800/60'), out);
+	assert.ok(out.includes('hover:bg-gray-100 dark:hover:bg-slate-700/50'), out);
 	// the Install button (module without an instance) is green, not blue
 	const inst = /<button onclick="ramInstallFromExplorer[^>]*class="([^"]*)"/.exec(out);
 	assert.ok(inst, out);