Add styles for changelog panel and list

src/styles.css

@@ -744,6 +744,51 @@ textarea.input {
   font-size: 0.95em;
 }
 
+.changelog-toggle-row {
+  margin-top: 14px;
+}
+
+.changelog-panel {
+  margin-top: 12px;
+  padding: 14px 16px;
+  border: 1px solid var(--border);
+  border-radius: 10px;
+  background-color: var(--input-bg);
+}
+
+.changelog-list {
+  margin: 0;
+  padding-left: 18px;
+  color: var(--text);
+}
+
+.changelog-item + .changelog-item {
+  margin-top: 12px;
+}
+
+.changelog-message {
+  line-height: 1.5;
+  word-break: break-word;
+}
+
+.changelog-item-meta {
+  margin-top: 4px;
+  display: flex;
+  flex-wrap: wrap;
+  gap: 10px;
+  color: var(--muted);
+  font-size: 0.92em;
+}
+
+.changelog-pagination {
+  margin-top: 14px;
+}
+
+.changelog-page-label {
+  color: var(--muted);
+  font-variant-numeric: tabular-nums;
+}
+
 /* Markdown Styles */
 .msg h1, .msg h2, .msg h3, .msg h4 {
   margin: 10px 0;