first stab at adding video

static/index.html

@@ -12,6 +12,17 @@
     <span id="status-badge">Disconnected</span>
   </header>
 
+  <div id="stage">
+    <video
+      id="avatar-video"
+      autoplay
+      muted
+      loop
+      playsinline
+      preload="auto"
+    ></video>
+  </div>
+
   <div id="chat-area"></div>
 
   <details id="voice-panel">
@@ -40,6 +51,27 @@
     </div>
   </details>
 
+  <details id="avatar-panel">
+    <summary>Avatar / Video</summary>
+    <div class="panel-content">
+      <label>
+        Avatar image
+        <input type="file" id="avatar-file" accept="image/*" />
+      </label>
+      <button id="upload-avatar-btn" onclick="uploadAvatar()">Upload</button>
+      <label>
+        Mode
+        <select id="video-mode-select">
+          <option value="off">Off</option>
+          <option value="library">Library (pre-baked)</option>
+          <option value="reflective" selected>Reflective (per-turn)</option>
+        </select>
+      </label>
+      <button id="apply-mode-btn" onclick="applyVideoMode()">Apply mode</button>
+      <span id="avatar-status"></span>
+    </div>
+  </details>
+
   <div id="controls">
     <button id="mic-btn" onclick="toggleMic()">&#x1F3A4;</button>
   </div>