chore: Ensure comment data is validated before persisting (#6322)

Fix flash on render of comment create

server/routes/api/schema.ts

@@ -0,0 +1,21 @@
+import formidable from "formidable";
+import { Node } from "prosemirror-model";
+import { z } from "zod";
+import { ProsemirrorData as TProsemirrorData } from "@shared/types";
+import { schema } from "@server/editor";
+
+export const BaseSchema = z.object({
+  body: z.unknown(),
+  query: z.unknown(),
+  file: z.custom<formidable.File>().optional(),
+});
+
+export const ProsemirrorSchema = z.custom<TProsemirrorData>((val) => {
+  try {
+    const node = Node.fromJSON(schema, val);
+    node.check();
+    return true;
+  } catch {
+    return false;
+  }
+}, "not valid data");