feat: editor attachment paste handling (#1975)

* reupload attachments if uploaded to a different page
* use image dimensions on paste/DnD

* tooltips withinPortal:false

* isolating attribute

packages/editor-ext/src/lib/math/math-block.ts

@@ -24,6 +24,7 @@ export const MathBlock = Node.create({
   name: "mathBlock",
   group: "block",
   atom: true,
+  isolating: true,
 
   addOptions() {
     return {