fix: resolve TypeScript errors in frontend build

node_modules/prosemirror-gapcursor/dist/index.d.cts

@@ -0,0 +1,31 @@
+import { Selection, Plugin } from 'prosemirror-state';
+import { ResolvedPos, Node, Slice } from 'prosemirror-model';
+import { Mappable } from 'prosemirror-transform';
+
+/**
+Gap cursor selections are represented using this class. Its
+`$anchor` and `$head` properties both point at the cursor position.
+*/
+declare class GapCursor extends Selection {
+    /**
+    Create a gap cursor.
+    */
+    constructor($pos: ResolvedPos);
+    map(doc: Node, mapping: Mappable): Selection;
+    content(): Slice;
+    eq(other: Selection): boolean;
+    toJSON(): any;
+}
+
+/**
+Create a gap cursor plugin. When enabled, this will capture clicks
+near and arrow-key-motion past places that don't have a normally
+selectable position nearby, and create a gap cursor selection for
+them. The cursor is drawn as an element with class
+`ProseMirror-gapcursor`. You can either include
+`style/gapcursor.css` from the package's directory or add your own
+styles to make it visible.
+*/
+declare function gapCursor(): Plugin;
+
+export { GapCursor, gapCursor };