test: add e2e test and golden for transcript-server

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: ochafik

tests/e2e/servers.spec.ts

@@ -22,6 +22,7 @@ const DYNAMIC_MASKS: Record<string, string[]> = {
     "#info-uptime", // System uptime
   ],
   threejs: ["#threejs-canvas", ".threejs-container"], // 3D render canvas (dynamic animation)
+  transcript: ["#timer"], // Timer display (dynamic when recording)
   "wiki-explorer": ["#graph"], // Force-directed graph (dynamic layout)
 };
 
@@ -41,6 +42,7 @@ const SERVERS = [
   { key: "sheet-music", name: "Sheet Music Server" },
   { key: "system-monitor", name: "System Monitor Server" },
   { key: "threejs", name: "Three.js Server" },
+  { key: "transcript", name: "Transcript Server" },
   { key: "wiki-explorer", name: "Wiki Explorer" },
 ];