Run God's Eye View inside the MCP Apps panel instead of framing it

Hosts such as Claude do not let a panel frame other sites, so the panel
now loads the app's page, styles and scripts into itself in inline embed
mode, and declares the app and map providers as resource and connect
domains. The dev server answers panel origins with CORS.

src/app/embed.test.mjs

@@ -152,6 +152,41 @@ test('an embedded page takes views only from its parent and answers it', async (
   remove();
 });
 
+test('an app loaded inline into a panel page talks through its own window', async () => {
+  const posted = [];
+  const windowRef = new EventTarget();
+  windowRef.parent = windowRef;
+  windowRef.postMessage = (message) => posted.push(message);
+  windowRef.document = { body: { classList: new Set() } };
+  windowRef.document.body.classList.add = Set.prototype.add;
+  globalThis.GEV_EMBED_INLINE = true;
+  try {
+    assert.equal(isEmbedded({ search: '' }), true);
+    const remove = installViews({
+      shell: { initialRestorePromise: Promise.resolve() },
+      viewer: fakeViewer(),
+      dataManager: fakeLayers(new Set()),
+      run: recorder().run,
+      location: { search: '', hash: '' },
+      windowRef,
+    });
+    await new Promise((resolve) => setTimeout(resolve, 0));
+    assert.deepEqual(posted, [{ type: 'gev:ready' }]);
+    const event = new Event('message');
+    Object.assign(event, {
+      source: windowRef,
+      data: { type: 'gev:view', id: 7, view: { camera: { lat: 1, lon: 2 } } },
+    });
+    windowRef.dispatchEvent(event);
+    await new Promise((resolve) => setTimeout(resolve, 10));
+    assert.equal(posted[1].id, 7);
+    assert.equal(posted[1].ok, true);
+    remove();
+  } finally {
+    delete globalThis.GEV_EMBED_INLINE;
+  }
+});
+
 test('annotations in a link are drawn after it restores, embedded or not', async () => {
   const { calls, run } = recorder();
   const an = encodeURIComponent(