chore(calls): bump @lotusguild/element-call-embedded to 0.25.0-lotus.8

Picks up the fork change that shows the SFU token service's refusal reason
("Can't join this call — This voice channel is full.") instead of the generic
OPEN_ID_ERROR page. Verified headless with a routed 403 on /sfu/get.
(lotus.6/7 were tagged but failed CI lint; lotus.8 is the published one.)

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA

package.json

@@ -107,7 +107,7 @@
     "workbox-precaching": "7.4.1"
   },
   "devDependencies": {
-    "@lotusguild/element-call-embedded": "0.25.0-lotus.4",
+    "@lotusguild/element-call-embedded": "0.25.0-lotus.8",
     "@playwright/test": "1.63.0",
     "@rollup/plugin-inject": "5.0.5",
     "@rollup/plugin-wasm": "6.2.2",