feat: File attachments (#3031)

* stash

* refactor, working in non-collab + collab editor

* attachment styling

* Avoid crypto require in browser

* AttachmentIcon, handling unknown types

* Do not allow attachment creation for file sizes over limit

* Allow image as file attachment

* Upload placeholder styling

* lint

* Refactor: Do not use placeholder for file attachmentuploads

* Add loading spinner

* fix: Extra paragraphs around attachments on insert

* Bump editor

* fix build error

* Remove attachment placeholder when upload fails

* Remove unused styles

* fix: Attachments on shared pages

* Merge fixes

app/models/FileOperation.ts

@@ -1,4 +1,5 @@
 import { computed } from "mobx";
+import { bytesToHumanReadable } from "@shared/utils/files";
 import BaseModal from "./BaseModel";
 import User from "./User";
 
@@ -23,13 +24,7 @@ class FileOperation extends BaseModal {
 
   @computed
   get sizeInMB(): string {
-    const inKB = this.size / 1024;
-
-    if (inKB < 1024) {
-      return inKB.toFixed(2) + "KB";
-    }
-
-    return (inKB / 1024).toFixed(2) + "MB";
+    return bytesToHumanReadable(this.size);
   }
 }