build(web): pull in threadnet-call-embedded 0.19.2-threadnet.8

Brings the AI noise suppression (ADR-0018) into the widget we actually ship.
The .7 package built and ran fine but carried no model assets, because the
embedded Vite config had publicDir off — the filter would have been dead only
inside the widget, and nowhere else.

Verified the whole chain locally rather than trusting the green build: the
23 MB of model and wasm arrive under webapp/widgets/element-call/assets/dfn3,
which is the path the widget requests at runtime.

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

apps/web/package.json

@@ -125,7 +125,7 @@
         "@babel/preset-react": "^7.12.10",
         "@babel/preset-typescript": "^7.12.7",
         "@casualbot/jest-sonar-reporter": "2.7.0",
-        "@sorb/threadnet-call-embedded": "0.19.2-threadnet.7",
+        "@sorb/threadnet-call-embedded": "0.19.2-threadnet.8",
         "@element-hq/element-web-playwright-common": "workspace:*",
         "@fetch-mock/jest": "^0.2.20",
         "@jest/globals": "^30.2.0",