Update sidebar

app/static/styles.css

@@ -164,6 +164,51 @@ button:disabled {
   overflow: auto;
 }
 
+.device-section-item {
+  list-style: none;
+  margin-bottom: 8px;
+}
+
+.device-section {
+  border: 1px solid var(--border);
+  border-radius: 12px;
+  background: rgba(255,255,255,0.015);
+  overflow: hidden;
+}
+
+.device-section-summary {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: 11px 12px;
+  cursor: pointer;
+  font-weight: 600;
+  list-style: none;
+  user-select: none;
+}
+
+.device-section-summary::-webkit-details-marker {
+  display: none;
+}
+
+.device-section-count {
+  min-width: 28px;
+  padding: 2px 8px;
+  border: 1px solid var(--border);
+  border-radius: 999px;
+  background: rgba(255,255,255,0.03);
+  color: var(--muted);
+  font-size: 0.78rem;
+  text-align: center;
+}
+
+.device-section-list {
+  list-style: none;
+  margin: 0;
+  padding: 0 6px 6px;
+  border-top: 1px solid rgba(255,255,255,0.04);
+}
+
 .device-item {
   border: 1px solid transparent;
   border-radius: 10px;
@@ -173,6 +218,16 @@ button:disabled {
   cursor: pointer;
 }
 
+.device-section-list .device-item:first-child {
+  margin-top: 6px;
+}
+
+.device-empty {
+  padding: 12px 10px;
+  color: var(--muted);
+  font-size: 0.84rem;
+}
+
 .device-item:hover { border-color: #33516b; }
 .device-item.active { border-color: var(--accent); background: rgba(93,196,255,0.08); }