feat(bridge): add wifi/serial bridge runtime and UI

Co-authored-by: Cursor <cursoragent@cursor.com>

src/static/zone-devices-panel.js

@@ -0,0 +1,27 @@
+/**
+ * Scrollable device/group list with a fixed add row (dropdown + button) below.
+ * Used by group and zone edit modals.
+ */
+function prepareZoneDevicesPanel(containerEl) {
+    if (!containerEl) return null;
+    let listEl = containerEl.querySelector('.zone-devices-list');
+    let addSlot = containerEl.querySelector('.zone-devices-add-slot');
+    if (!listEl) {
+        containerEl.innerHTML = '';
+        containerEl.classList.add('zone-devices-panel');
+        listEl = document.createElement('div');
+        listEl.className = 'zone-devices-list';
+        addSlot = document.createElement('div');
+        addSlot.className = 'zone-devices-add-slot';
+        containerEl.appendChild(listEl);
+        containerEl.appendChild(addSlot);
+    } else {
+        listEl.innerHTML = '';
+        addSlot.innerHTML = '';
+    }
+    return { listEl, addSlot };
+}
+
+if (typeof window !== 'undefined') {
+    window.prepareZoneDevicesPanel = prepareZoneDevicesPanel;
+}