fix(0.6.1): About page restructure — balance the layout

By v0.6.0 the About page had eight version-history entries, each a
full paragraph, dwarfing the other cards and pushing Credits + thanks
off the visible area.

- Three short cards on top (What / Who / Credits) — equal-height,
  balanced row. Credits gets equal billing instead of being a fourth
  card buried under a wall of version notes.
- Version history is its own full-width card below. Only the latest
  release is shown in full; earlier releases collapse to one line
  each. The card now stays compact however many versions ship —
  adding a future release adds one line, not a paragraph.
- Full prose for older versions lives in CHANGELOG.md on Gitea via
  the existing "View the full CHANGELOG.md →" link. Single source of
  truth.

Files: radio.php (version), inc/about.php (3-card top + new
.radio-about-versions block with __latest / __earlier sub-elements;
9 versions in the earlier-releases list incl. v0.1.0),
assets/css/radio.css (drop dead .radio-about-card--versions rules;
add .radio-about-versions + __latest + __earlier; dark-theme overrides).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

assets/css/radio.css

@@ -359,27 +359,50 @@
     padding-top: 0;
 }
 
-.radio-about-card--versions ul {
-    list-style: none;
-    padding: 12px;
-    margin: 0;
+.radio-about-changelog-link {
+    display: inline-block;
+    margin: 0 12px 12px;
+    font-size: 13px;
+    color: var(--wp-admin-theme-color, #2271b1);
+    text-decoration: none;
+}
+.radio-about-changelog-link:hover { text-decoration: underline; }
+
+/* ──────────────────────────────────────────────────────────────────
+ * Version history — full-width card BELOW the top row of cards
+ * (v0.6.1). Latest release shown in full; earlier releases collapse
+ * to one line each so the card stays compact however many versions
+ * ship. Full prose for older versions lives in the CHANGELOG on Gitea.
+ * ─────────────────────────────────────────────────────────────── */
+
+.radio-about-versions {
+    max-width: 1100px;
+    margin-top: 16px;
+    background: #fff;
+    border: 1px solid #c3c4c7;
+    box-shadow: 0 1px 1px rgba(0, 0, 0, 0.04);
 }
 
-.radio-about-card--versions li {
-    margin-bottom: 10px;
+.radio-about-versions h2 {
+    margin: 0;
+    padding: 8px 12px;
+    font-size: 14px;
+    font-weight: 600;
+    background: #f6f7f7;
+    border-bottom: 1px solid #c3c4c7;
+}
+
+.radio-about-versions__latest {
+    padding: 12px 12px 8px;
+}
+
+.radio-about-versions__latest .ver {
+    font-weight: 600;
+    color: var(--wp-admin-theme-color, #2271b1);
     font-size: 13px;
 }
 
-.radio-about-card--versions li:last-child {
-    margin-bottom: 0;
-}
-
-.radio-about-card--versions .ver {
-    font-weight: 600;
-    color: var(--wp-admin-theme-color, #2271b1);
-}
-
-.radio-about-card--versions .latest {
+.radio-about-versions__latest .latest {
     display: inline-block;
     margin-left: 6px;
     padding: 1px 7px;
@@ -391,16 +414,47 @@
     vertical-align: middle;
 }
 
-.radio-about-changelog-link {
-    display: inline-block;
-    margin: 0 12px 12px;
+.radio-about-versions__latest p {
+    margin: 6px 0 0;
     font-size: 13px;
-    color: var(--wp-admin-theme-color, #2271b1);
-    text-decoration: none;
+    color: #1d2327;
 }
 
-.radio-about-changelog-link:hover {
-    text-decoration: underline;
+.radio-about-versions h3 {
+    margin: 4px 0 0;
+    padding: 8px 12px 4px;
+    font-size: 11px;
+    font-weight: 600;
+    color: #646970;
+    text-transform: uppercase;
+    letter-spacing: 0.06em;
+    border-top: 1px solid #f0f0f1;
+}
+
+.radio-about-versions__earlier {
+    list-style: none;
+    margin: 0;
+    padding: 4px 12px 8px;
+}
+
+.radio-about-versions__earlier li {
+    padding: 4px 0;
+    font-size: 13px;
+    color: #50575e;
+}
+
+.radio-about-versions__earlier .ver {
+    display: inline-block;
+    min-width: 48px;
+    font-weight: 600;
+    color: var(--wp-admin-theme-color, #2271b1);
+}
+
+.radio-about-versions__earlier .ver-date {
+    display: inline-block;
+    min-width: 110px;
+    font-size: 11px;
+    color: #646970;
 }
 
 /* ──────────────────────────────────────────────────────────────────
@@ -450,6 +504,12 @@
     color: #f0f0f1;
     border-bottom-color: #3c434a;
 }
+.radio-theme-dark .radio-about-versions { background: #1d2327; border-color: #3c434a; color: #c3c4c7; }
+.radio-theme-dark .radio-about-versions h2 { background: #2c3338; color: #f0f0f1; border-bottom-color: #3c434a; }
+.radio-theme-dark .radio-about-versions h3 { color: #a7aaad; border-top-color: #3c434a; }
+.radio-theme-dark .radio-about-versions__latest p { color: #c3c4c7; }
+.radio-theme-dark .radio-about-versions__earlier li { color: #c3c4c7; }
+.radio-theme-dark .radio-about-versions__earlier .ver-date { color: #a7aaad; }
 .radio-theme-dark #radio_dashboard_widget .radio-player__credit {
     border-top-color: #3c434a;
 }