Merge main and switch Cesium and Navara in place through Vue

Preserve the camera, map source and layer selection across engine sessions. Restore the previous engine if startup fails and retain local history navigation.

scripts/qa-firms.mjs

@@ -253,16 +253,20 @@ async function main() {
 
   try {
     const res = await fetch(APP_URL);
+    // Only the status matters; an unread body can hold the socket open.
+    await res.body?.cancel();
     if (!res.ok) throw new Error(`HTTP ${res.status}`);
   } catch (e) {
     console.error(`\x1b[31mDev server not reachable at ${APP_URL} (${e.message}).\x1b[0m`);
-    process.exit(2);
+    process.exitCode = 2;
+    return;
   }
 
   const status = await fetch(`${APP_URL}/api/firms/status`).then((r) => r.json()).catch(() => null);
   if (!FIXTURES && !status?.hasKey) {
     console.error('\x1b[31mServer has no FIRMS key — run against the keyed dev server (:4420).\x1b[0m');
-    process.exit(2);
+    process.exitCode = 2;
+    return;
   }
 
   fs.mkdirSync(SHOTS_DIR, { recursive: true });