fix: right-click paste for images in clipboard (Issue #8826) (#8845)

* Fix right-click paste command for images (Issue #8826)

* Fix clipboard logic for multiple paste types

* fix: remove unused code

* refactor & robustness

* fix: creating paste event with image files

---------

Co-authored-by: dwelle <5153846+dwelle@users.noreply.github.com>

packages/excalidraw/constants.ts

@@ -214,9 +214,9 @@ export const IMAGE_MIME_TYPES = {
   jfif: "image/jfif",
 } as const;
 
-export const ALLOWED_PASTE_MIME_TYPES = ["text/plain", "text/html"] as const;
-
 export const MIME_TYPES = {
+  text: "text/plain",
+  html: "text/html",
   json: "application/json",
   // excalidraw data
   excalidraw: "application/vnd.excalidraw+json",
@@ -230,6 +230,12 @@ export const MIME_TYPES = {
   ...IMAGE_MIME_TYPES,
 } as const;
 
+export const ALLOWED_PASTE_MIME_TYPES = [
+  MIME_TYPES.text,
+  MIME_TYPES.html,
+  ...Object.values(IMAGE_MIME_TYPES),
+] as const;
+
 export const EXPORT_IMAGE_TYPES = {
   png: "png",
   svg: "svg",