feat(api): parallel group sends and batch identify

- asyncio.gather for group brightness and driver-config Wi-Fi pushes
- Batch identify envelope for group members

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

src/static/groups.js

@@ -326,6 +326,16 @@ function renderGroupsList(groups) {
             }
         });
 
+        const identifyBtn = document.createElement('button');
+        identifyBtn.className = 'btn btn-secondary btn-small';
+        identifyBtn.type = 'button';
+        identifyBtn.textContent = 'Identify';
+        identifyBtn.title =
+            'Identify all devices in this group at once (red blink at 10 Hz)';
+        identifyBtn.addEventListener('click', async () => {
+            await identifyGroupById(gid);
+        });
+
         const delBtn = document.createElement('button');
         delBtn.className = 'btn btn-danger btn-small';
         delBtn.textContent = 'Delete';
@@ -348,11 +358,40 @@ function renderGroupsList(groups) {
         row.appendChild(editBtn);
         row.appendChild(brightBtn);
         row.appendChild(applyBtn);
+        row.appendChild(identifyBtn);
         row.appendChild(delBtn);
         container.appendChild(row);
     });
 }
 
+async function identifyGroupById(gid) {
+    if (!gid) return;
+    try {
+        const res = await fetch(`/groups/${encodeURIComponent(gid)}/identify`, {
+            method: 'POST',
+            credentials: 'same-origin',
+            headers: { Accept: 'application/json' },
+        });
+        const data = await res.json().catch(() => ({}));
+        if (!res.ok) {
+            alert(data.error || 'Identify failed');
+            return;
+        }
+        const n = typeof data.sent === 'number' ? data.sent : 0;
+        const errs = Array.isArray(data.errors) ? data.errors : [];
+        const failed = errs.filter((e) => e && e.error).length;
+        let msg = n ? `Identify sent to ${n} device(s).` : 'No devices received identify.';
+        if (failed) {
+            msg += ` ${failed} failed — see console for details.`;
+            console.warn('Group identify errors', errs);
+        }
+        alert(msg);
+    } catch (e) {
+        console.error(e);
+        alert('Identify failed');
+    }
+}
+
 document.addEventListener('DOMContentLoaded', () => {
     const groupsBtn = document.getElementById('groups-btn');
     const groupsModal = document.getElementById('groups-modal');
@@ -381,6 +420,16 @@ document.addEventListener('DOMContentLoaded', () => {
         });
     }
 
+    const editIdentifyBtn = document.getElementById('edit-group-identify-btn');
+    if (editIdentifyBtn) {
+        editIdentifyBtn.addEventListener('click', async () => {
+            const idInput = document.getElementById('edit-group-id');
+            const gid = idInput && idInput.value;
+            if (!gid) return;
+            await identifyGroupById(gid);
+        });
+    }
+
     const createHandler = async () => {
         const name = newNameInput && newNameInput.value.trim();
         if (!name) return;
@@ -449,4 +498,15 @@ document.addEventListener('DOMContentLoaded', () => {
     if (editCloseBtn && editModal) {
         editCloseBtn.addEventListener('click', () => editModal.classList.remove('active'));
     }
+
+    window.openDeviceGroupsModal = async () => {
+        const gm = document.getElementById('groups-modal');
+        if (!gm) return;
+        gm.classList.add('active');
+        try {
+            await loadGroupsModal();
+        } catch (e) {
+            console.error('openDeviceGroupsModal', e);
+        }
+    };
 });