Refine homepage layout: install, Stay updated, Changelog/FAQ, Visual Mode

- Restructure install section into a split primary card with the
  recommended path on the left and other install methods on the right
- Drop the prefix toggle UI; bundle name is now baked into data-bundle
- Balance the Stay updated step as paired Substack iframe + X follow card
  with matching height, border, and treatment
- Pair Changelog and FAQ side-by-side on desktop with a centered divider
  and shared border-top; section nav highlights both when in view
- Tone down the Visual Mode demo by removing side-tab borders, stacked
  card icons, and tiny body text so the overlay reads cleanly
- Refine the Chrome extension callout: drop the pill badge, use an
  editorial eyebrow above the title, enlarge the thumbnail
- Exclude private evals/ directory from version control

public/css/workflow.css

@@ -1068,6 +1068,34 @@
   border-bottom-color: var(--color-accent);
 }
 
+/* ============================================
+   CHANGELOG + FAQ ROW (side-by-side on desktop)
+   ============================================ */
+
+.changelog-faq-row {
+  position: relative;
+}
+
+@media (min-width: 1024px) {
+  .changelog-faq-row {
+    display: grid;
+    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
+    column-gap: calc(var(--spacing-xl) * 1.5);
+    border-top: 1px solid var(--color-mist);
+  }
+
+  .changelog-faq-row > .changelog-section,
+  .changelog-faq-row > .faq-section {
+    border-top: none;
+  }
+
+  .changelog-faq-row > .faq-section {
+    border-left: 1px solid var(--color-mist);
+    padding-left: calc(var(--spacing-xl) * 0.75);
+    margin-left: calc(var(--spacing-xl) * -0.75);
+  }
+}
+
 /* ============================================
    CHANGELOG SECTION
    ============================================ */