fix(ui): editable region boundaries not persisting on refresh (freeCodeCamp#55658)

Author: dwrik

client/src/redux/prop-types.ts

@@ -364,6 +364,7 @@ export type SavedChallengeFile = {
   ext: Ext;
   name: string;
   history?: string[];
+  editableRegionBoundaries?: number[];
   contents: string;
 };
 

client/src/templates/Challenges/classic/saved-challenges.ts

@@ -23,6 +23,8 @@ export function mergeChallengeFiles(
 
   return sortedChallengeFiles.map((file, index) => ({
     ...file,
-    contents: sortedSavedChallengeFiles[index].contents
+    contents: sortedSavedChallengeFiles[index].contents,
+    editableRegionBoundaries:
+      sortedSavedChallengeFiles[index].editableRegionBoundaries
   }));
 }