test(install/macos): give a just-launched historical app longer to Quit

The v2026.7.1 app launched by the latest DMG was still starting its backend
and did not finish a normal Quit within 30s. Wait up to 120s; the quit must
still be the normal one (no force-kill).

tests/install/macos-desktop-e2e.sh

@@ -258,7 +258,10 @@ phase_install() {
       const app = apps.objectAtIndex(i);
       if (app.executableURL && ObjC.unwrap(app.executableURL.path) === args[0]) {
         if (!app.terminate) throw new Error("normal Quit refused");
-        const deadline = Date.now() + 30000;
+        // A historical app (v2026.7.1) that the bootstrap launched moments ago
+        // was seen not to finish quitting within 30s while its backend was
+        // still starting. Allow longer, but the quit must stay the normal one.
+        const deadline = Date.now() + 120000;
         while (!app.terminated && Date.now() < deadline) delay(0.2);
         if (!app.terminated) throw new Error("installed app did not quit normally");
       }