feat(pages): add reusable page block editor and renderer baseline

apps/admin/src/components/pages/create-page-form.test.tsx

@@ -11,7 +11,9 @@ describe("CreatePageForm", () => {
 
     expect((screen.getByLabelText("Title") as HTMLInputElement).name).toBe("title")
     expect((screen.getByLabelText("Slug") as HTMLInputElement).name).toBe("slug")
-    expect((screen.getByLabelText("Content") as HTMLTextAreaElement).name).toBe("content")
+    const contentField = document.querySelector('input[name="content"]') as HTMLInputElement | null
+    expect(contentField).not.toBeNull()
+    expect(contentField?.value.startsWith("[")).toBe(true)
 
     const status = screen.getByLabelText("Status") as HTMLSelectElement
     expect(status.value).toBe("draft")