feat: rewrite library state management & related refactor (#5067)

* support libraryItems promise for `updateScene()` and use `importLibrary`

* fix typing for `getLibraryItemsFromStorage()`

* remove `libraryItemsFromStorage` hack

if there was a point to it then I'm missing it, but this part will be rewritten anyway

* rewrite state handling

(temporarily removed loading states)

* add async support

* refactor and deduplicate library importing logic

* hide hints when library open

* fix snaps

* support promise in `initialData.libraryItems`

* add default to params instead

src/locales/en.json

@@ -172,7 +172,6 @@
     "uploadedSecurly": "The upload has been secured with end-to-end encryption, which means that Excalidraw server and third parties can't read the content.",
     "loadSceneOverridePrompt": "Loading external drawing will replace your existing content. Do you wish to continue?",
     "collabStopOverridePrompt": "Stopping the session will overwrite your previous, locally stored drawing. Are you sure?\n\n(If you want to keep your local drawing, simply close the browser tab instead.)",
-    "errorLoadingLibrary": "There was an error loading the third party library.",
     "errorAddingToLibrary": "Couldn't add item to the library",
     "errorRemovingFromLibrary": "Couldn't remove item from the library",
     "confirmAddLibrary": "This will add {{numShapes}} shape(s) to your library. Are you sure?",
@@ -189,7 +188,8 @@
     "fileTooBig": "File is too big. Maximum allowed size is {{maxSize}}.",
     "svgImageInsertError": "Couldn't insert SVG image. The SVG markup looks invalid.",
     "invalidSVGString": "Invalid SVG.",
-    "cannotResolveCollabServer": "Couldn't connect to the collab server. Please reload the page and try again."
+    "cannotResolveCollabServer": "Couldn't connect to the collab server. Please reload the page and try again.",
+    "importLibraryError": "Couldn't load library"
   },
   "toolBar": {
     "selection": "Selection",