Add camera selection feature to dashboard

- Introduced a dropdown for selecting cameras in the dashboard.
- Implemented functions to load available cameras and handle camera selection.
- Updated polling logic to reflect the currently selected camera.
- Enhanced styling for the camera selection dropdown.

templates/dashboard.html

@@ -78,6 +78,15 @@
   @keyframes pulse { 0%,100%{ opacity:1 } 50%{ opacity:.35 } }
 
   .clock { font-size: .85rem; color: var(--text-dim); font-variant-numeric: tabular-nums; }
+  .camera-select {
+    background: var(--surface-2);
+    color: var(--text);
+    border: 1px solid var(--border);
+    border-radius: 8px;
+    padding: 6px 10px;
+    font-size: .85rem;
+    min-width: 170px;
+  }
 
   /* -------- Layout -------- */
   .container {
@@ -292,6 +301,7 @@
     Surveillance Dashboard
   </div>
   <div class="header-right">
+    <select id="cameraSelect" class="camera-select"></select>
     <div class="status-badge connecting" id="statusBadge">
       <span class="dot"></span>
       <span id="statusText">Connecting</span>
@@ -368,6 +378,33 @@ updateClock();
 
 let prevAlertActive = false;
 let bannerTimeout = null;
+let camerasLoaded = false;
+
+async function loadCameras() {
+  try {
+    const res = await fetch('/api/cameras');
+    const data = await res.json();
+    const select = document.getElementById('cameraSelect');
+    select.innerHTML = data.cameras
+      .map(c => `<option value="${c.id}">${c.name} (${c.ip})</option>`)
+      .join('');
+    camerasLoaded = true;
+  } catch (e) {
+    console.error('Failed to load cameras', e);
+  }
+}
+
+async function selectCamera(cameraId) {
+  try {
+    await fetch('/api/camera/select', {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ camera_id: cameraId })
+    });
+  } catch (e) {
+    console.error('Failed to switch camera', e);
+  }
+}
 
 async function poll() {
   try {
@@ -387,6 +424,16 @@ async function poll() {
     badge.className = 'status-badge ' + d.stream_status;
     stext.textContent = d.stream_status === 'live' ? 'Live' :
                         d.stream_status === 'error' ? 'Error' : 'Connecting';
+    if (d.active_camera_name) {
+      stext.textContent = `${stext.textContent} - ${d.active_camera_name}`;
+    }
+
+    if (camerasLoaded) {
+      const cameraSelect = document.getElementById('cameraSelect');
+      if (cameraSelect.value !== d.selected_camera_id) {
+        cameraSelect.value = d.selected_camera_id;
+      }
+    }
 
     // Alert KPI glow
     const kpiAlerts = document.getElementById('kpiAlerts');
@@ -446,6 +493,10 @@ function openLightbox(src) {
 }
 
 setInterval(poll, 1000);
+document.getElementById('cameraSelect').addEventListener('change', (e) => {
+  selectCamera(e.target.value);
+});
+loadCameras().then(poll);
 poll();
 </script>
 </body>