feat: add config subsections in control ui

ui/src/styles/config.css

@@ -358,6 +358,98 @@
   color: var(--ok);
 }
 
+/* Section Hero */
+.config-section-hero {
+  display: flex;
+  align-items: center;
+  gap: 14px;
+  padding: 14px 20px;
+  border-bottom: 1px solid var(--border);
+  background: rgba(0, 0, 0, 0.04);
+}
+
+:root[data-theme="light"] .config-section-hero {
+  background: rgba(0, 0, 0, 0.015);
+}
+
+.config-section-hero__icon {
+  width: 28px;
+  height: 28px;
+  color: var(--accent);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.config-section-hero__icon svg {
+  width: 100%;
+  height: 100%;
+  stroke: currentColor;
+  fill: none;
+}
+
+.config-section-hero__text {
+  display: grid;
+  gap: 2px;
+  min-width: 0;
+}
+
+.config-section-hero__title {
+  font-size: 15px;
+  font-weight: 600;
+}
+
+.config-section-hero__desc {
+  font-size: 12px;
+  color: var(--muted);
+}
+
+/* Subsection Nav */
+.config-subnav {
+  display: flex;
+  gap: 8px;
+  padding: 10px 20px 12px;
+  border-bottom: 1px solid var(--border);
+  background: rgba(0, 0, 0, 0.03);
+  overflow-x: auto;
+}
+
+:root[data-theme="light"] .config-subnav {
+  background: rgba(0, 0, 0, 0.02);
+}
+
+.config-subnav__item {
+  border: 1px solid transparent;
+  border-radius: 999px;
+  padding: 6px 12px;
+  font-size: 12px;
+  font-weight: 600;
+  color: var(--muted);
+  background: rgba(0, 0, 0, 0.12);
+  cursor: pointer;
+  transition: background 150ms ease, color 150ms ease, border-color 150ms ease;
+  white-space: nowrap;
+}
+
+:root[data-theme="light"] .config-subnav__item {
+  background: rgba(0, 0, 0, 0.06);
+}
+
+.config-subnav__item:hover {
+  color: var(--text);
+  background: rgba(255, 255, 255, 0.08);
+}
+
+:root[data-theme="light"] .config-subnav__item:hover {
+  background: rgba(0, 0, 0, 0.08);
+}
+
+.config-subnav__item.active {
+  color: var(--accent);
+  border-color: rgba(245, 159, 74, 0.4);
+  background: rgba(245, 159, 74, 0.12);
+}
+
 /* Content Area */
 .config-content {
   flex: 1;
@@ -1243,6 +1335,14 @@
     justify-content: center;
   }
 
+  .config-section-hero {
+    padding: 12px 16px;
+  }
+
+  .config-subnav {
+    padding: 8px 16px 10px;
+  }
+
   .config-content {
     padding: 16px;
   }