test(e2e): build the embed bundle in globalSetup

The embed e2e mounts viewer/dist-embed/engine.js, but globalSetup only built
viewer/dist — so CI (clean checkout, no prior build:embed) failed with ENOENT
on the engine bundle. Build dist-embed in globalSetup too, alongside the viewer.

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

Author: benvinegar

e2e/globalSetup.ts

@@ -2,10 +2,10 @@ import { execSync } from "node:child_process";
 import { fileURLToPath } from "node:url";
 
 // Each test boots `node server/index.ts`, which serves viewer/dist/index.html
-// read at startup — build the viewer once before the suite runs.
+// read at startup — build the viewer once before the suite runs. The embed e2e
+// also mounts the embeddable engine bundle (viewer/dist-embed), so build that too.
 export default function globalSetup() {
-  execSync("npx vite build", {
-    cwd: fileURLToPath(new URL("..", import.meta.url)),
-    stdio: "inherit",
-  });
+  const cwd = fileURLToPath(new URL("..", import.meta.url));
+  execSync("npx vite build", { cwd, stdio: "inherit" });
+  execSync("npx vite build -c viewer/vite.embed.config.ts", { cwd, stdio: "inherit" });
 }