call: consume self-built Element Call fork + activate Lotus features

Switch to @lotusguild/element-call-embedded@0.20.1-lotus.1 (our self-built
fork) and turn on the source-level features it adds:

- #1 denoise CUTOVER: in-source ML denoise (lotusDenoiseSource=1) replaces
  the build-time getUserMedia shim — removed the shim injection from
  vite.config.js (denoise/ assets still shipped; the processor loads them).
  Survives reconnects (fixes A7).
- #2 call-state: CallEmbed consumes io.lotus.call_state; useCallSpeakers /
  useRemoteAllMuted prefer it over scraping EC's DOM (DOM fallback kept;
  empty payloads ignored).
- #4 focus: CallControl.focusCameraParticipant sends io.lotus.focus_participant
  (works during screenshare), replacing the DOM tile-click hack.
- #5 theming: lotusTransparent=1 (native transparent background).
- #6 decorations: LotusDecorationPusher sends each member's decoration URL
  via io.lotus.decorations -> rendered on in-call tiles.

#3 soundboard / #7 quality ship dormant (EC-ready; no host UI sends them yet).

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

src/app/plugins/call/CallControl.ts

@@ -346,71 +346,20 @@ export class CallControl extends EventEmitter implements CallControlState {
    * them yet).
    */
   public focusCameraParticipant(userId: string): void {
-    const doc = this.document;
-    if (!doc) return;
+    // [lotus #4] Pin the participant via the fork's widget action instead of
+    // DOM-poking tiles. EC's layout honors it — including surfacing the camera
+    // alongside a screenshare (A5) — and it's version-stable. The fork always
+    // acks, so the promise resolves regardless.
+    void this.call.transport
+      .send('io.lotus.focus_participant', { userId })
+      .catch(() => undefined);
+  }
 
-    // EC labels participant tiles inconsistently across versions — the user's
-    // matrix id may be the full aria-label, a substring of it, or carried on a
-    // data attribute (and sometimes the visible label is the display name, not
-    // the id at all). Try several strategies before giving up, then walk up to
-    // the enclosing video tile.
-    const findTile = (): HTMLElement | undefined => {
-      const escaped = CSS.escape(userId);
-      const el =
-        doc.querySelector<HTMLElement>(`[aria-label="${escaped}"]`) ??
-        doc.querySelector<HTMLElement>(`[data-testid="videoTile"][aria-label*="${escaped}"]`) ??
-        doc.querySelector<HTMLElement>(`[aria-label*="${escaped}"]`) ??
-        doc.querySelector<HTMLElement>(`[data-member-id="${escaped}"]`) ??
-        doc.querySelector<HTMLElement>(`[data-id="${escaped}"]`) ??
-        undefined;
-      return (
-        el?.closest<HTMLElement>('[data-testid="videoTile"]') ??
-        el?.closest<HTMLElement>('[data-video-fit]') ??
-        el ??
-        undefined
-      );
-    };
-
-    const applyFocus = () => {
-      const tile = findTile();
-      if (tile) {
-        tile.click();
-      } else if (import.meta.env.DEV) {
-        console.warn(`[CallControl] focusCameraParticipant: no tile matched ${userId}`);
-      }
-    };
-
-    if (this.spotlight) {
-      // Already in spotlight — pin immediately.
-      applyFocus();
-      return;
-    }
-
-    // Switching to spotlight re-renders EC's layout asynchronously; clicking the
-    // tile in the same tick would land in the old (grid) DOM. A fixed frame
-    // delay is unreliable (EC's React commit can exceed it on slow devices), so
-    // watch the iframe DOM for a spotlight video tile to mount, then focus —
-    // with a hard timeout so the click is always attempted at least once.
-    this.spotlightButton?.click();
-
-    const tileSelector = '[data-testid="videoTile"]';
-    let settled = false;
-    let observer: MutationObserver | undefined;
-    let timer: ReturnType<typeof setTimeout> | undefined;
-    const finish = () => {
-      if (settled) return;
-      settled = true;
-      if (timer) clearTimeout(timer);
-      observer?.disconnect();
-      applyFocus();
-    };
-    observer = new MutationObserver(() => {
-      if (doc.querySelector(tileSelector)) finish();
-    });
-    observer.observe(doc.body, { childList: true, subtree: true });
-    timer = setTimeout(finish, 600);
-    // A tile may already be present immediately after toggling spotlight.
-    if (doc.querySelector(tileSelector)) finish();
+  /** [lotus #4] Clear any manual spotlight pin and return to speaker-follows. */
+  public clearFocusParticipant(): void {
+    void this.call.transport
+      .send('io.lotus.focus_participant', { userId: null })
+      .catch(() => undefined);
   }
 
   public dispose() {