Sync voice chatId session handling

static/voice-demo/index.html

@@ -25,6 +25,34 @@
               autocomplete="off"
             />
           </label>
+          <label class="connection__field connection__field--chat">
+            <span>Chat ID</span>
+            <div class="chat-id-control">
+              <input
+                id="chat-id"
+                type="text"
+                placeholder="optional chatId"
+                spellcheck="false"
+                autocomplete="off"
+              />
+              <button
+                id="copy-chat-id-btn"
+                class="chat-id-control__copy"
+                type="button"
+                disabled
+                title="Copy Chat ID"
+                aria-label="Copy Chat ID"
+              >
+                <svg class="copy-icon copy-icon--default" viewBox="0 0 16 16" width="14" height="14" fill="none" aria-hidden="true">
+                  <rect x="5" y="5" width="8" height="9" rx="1.5" stroke="currentColor" stroke-width="1.4"/>
+                  <path d="M3 11V3.5A1.5 1.5 0 0 1 4.5 2H11" stroke="currentColor" stroke-width="1.4" stroke-linecap="round"/>
+                </svg>
+                <svg class="copy-icon copy-icon--check" viewBox="0 0 16 16" width="14" height="14" fill="none" aria-hidden="true">
+                  <path d="M3 8.5l3.5 3.5 6.5-7" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round"/>
+                </svg>
+              </button>
+            </div>
+          </label>
           <button id="connect-btn" class="btn btn--primary" type="button">
             Connect
           </button>