lotus(#7): audio/screenshare quality controls via widget action

Adds io.lotus.set_quality (toWidget): caps mic audio bitrate and
screenshare bitrate/framerate via RTCRtpSender.setParameters (no
republish). Settings are sticky and re-applied on LocalTrackPublished so
they survive mute/unmute and reconnects. These encoding controls lived in
EC's module scope, unreachable from the host against the prebuilt bundle.
Additive: no-op unless the host sends the action.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/room/InCallView.tsx

@@ -32,6 +32,7 @@ import { widget } from "../widget";
 import { startLotusCallState } from "../lotus/lotusCallState";
 import { startLotusFocus } from "../lotus/lotusFocus";
 import { startLotusAudioInject } from "../lotus/lotusAudioInject";
+import { startLotusQuality } from "../lotus/lotusQuality";
 import styles from "./InCallView.module.css";
 import { GridTile } from "../tile/GridTile";
 import { SettingsModal, defaultSettingsTab } from "../settings/SettingsModal";
@@ -291,6 +292,9 @@ export const InCallView: FC<InCallViewProps> = ({
   // [lotus] Handle the host's io.lotus.inject_audio action to mix a soundboard
   // clip into the call as a separate track (#3). No-op unless the host sends it.
   useEffect(() => startLotusAudioInject(vm), [vm]);
+  // [lotus] Handle the host's io.lotus.set_quality action to cap audio/
+  // screenshare encoding bitrate/framerate (#7). No-op unless the host sends it.
+  useEffect(() => startLotusQuality(vm), [vm]);
 
   const fatalCallError = useBehavior(vm.fatalError$);
   // Stop the rendering and throw for the error boundary