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>

vite.config.js

@@ -16,13 +16,15 @@ const copyFiles = {
       // widget URL (/public/element-call/index.html) resolves. v4.x of
       // vite-plugin-static-copy preserves the full source path under dest, so
       // we strip the 4 leading segments of the source base
-      // (node_modules/@element-hq/element-call-embedded/dist) — mirroring the
+      // (node_modules/@lotusguild/element-call-embedded/dist) — mirroring the
       // stripBase pattern used by the android/locales targets below. The old
       // `rename: 'element-call'` form silently produced
       // public/node_modules/.../dist/ under v4.x, 404ing the widget (calls
       // broke on cinny-desktop; web only worked because its deployed copy was
       // a stale artifact from before the vite-plugin-static-copy v4 bump).
-      src: 'node_modules/@element-hq/element-call-embedded/dist',
+      // Source is our self-built fork (LotusGuild/element-call) published to
+      // the Gitea npm registry; see HANDOFF_ELEMENT_CALL_FORK.md.
+      src: 'node_modules/@lotusguild/element-call-embedded/dist',
       dest: 'public/element-call',
       rename: { stripBase: 4 },
     },
@@ -159,34 +161,14 @@ function lotusDenoise() {
         fs.copyFileSync(s, d);
       });
 
-      const shimSrc = path.resolve('build/lotus-denoise.js');
-      if (!fs.existsSync(shimSrc)) {
-        throw new Error(`[lotus-denoise] Missing shim source ${shimSrc} — build aborted.`);
-      }
-      fs.copyFileSync(shimSrc, path.join(ecDir, 'lotus-denoise.js'));
-
-      // Inject the shim <script> into Element Call's index.html so it runs
-      // before EC captures the mic. Verify the injection actually landed —
-      // if EC's bundle ever drops its deferred module entry the replace would
-      // no-op and ML would silently never engage, so fail loudly.
-      const indexPath = path.join(ecDir, 'index.html');
-      if (fs.existsSync(indexPath)) {
-        let html = fs.readFileSync(indexPath, 'utf8');
-        if (!html.includes('lotus-denoise.js')) {
-          // Classic (non-deferred) script runs before EC's deferred module entry.
-          html = html.replace(
-            /<script type="module"/,
-            '<script src="./lotus-denoise.js"></script><script type="module"',
-          );
-          if (!html.includes('lotus-denoise.js')) {
-            throw new Error(
-              '[lotus-denoise] Failed to inject shim into Element Call index.html ' +
-                '(no `<script type="module">` entry found) — build aborted.',
-            );
-          }
-          fs.writeFileSync(indexPath, html);
-        }
-      }
+      // [lotus] DENOISE CUTOVER: the getUserMedia shim is no longer injected.
+      // Our forked Element Call now runs ML denoise in-source as a real LiveKit
+      // audio TrackProcessor (activated by lotusDenoiseSource=1 in CallEmbed),
+      // which survives reconnects (fixes A7). We still copy the denoise/ assets
+      // above because the in-source processor loads its worklets/wasm from
+      // ./denoise/ at runtime. To roll back to the shim: restore the
+      // copy+inject of build/lotus-denoise.js here and swap lotusDenoiseSource
+      // back to lotusDenoise=ml in CallEmbed.getWidget.
     },
   };
 }