feat: add seamless text and voice chat

tests/test_web_ui.py

@@ -12,12 +12,17 @@ def test_index_serves(client):
     assert "Hope" in body
     assert "livekit-client.umd.js" in body
     assert "app.js" in body
+    assert 'id="voiceModeBtn"' in body
+    assert 'id="textModeBtn"' in body
+    assert 'id="chatComposer"' in body
 
 
 def test_app_js_serves(client):
     resp = client.get("/app.js")
     assert resp.status_code == 200
     assert "LiveKitClient" in resp.text or "Room" in resp.text
+    assert 'topic: "lk.chat"' in resp.text
+    assert "sendModeMessage" in resp.text
 
 
 def test_style_css_serves(client):