chore: clean up code comments

lib/screens/libraries/alpha_jump_helper.dart

@@ -29,7 +29,6 @@ class AlphaJumpHelper {
   AlphaJumpHelper._(this.letters, this.letterToIndex, this.letterSizes, this.totalItemCount);
 
   factory AlphaJumpHelper(List<LibraryFirstCharacter> firstCharacters, {bool descending = false}) {
-    // Collect characters with their sizes.
     final entries = <({String letter, int size})>[];
     final letterSizes = <String, int>{};
 
@@ -41,13 +40,11 @@ class AlphaJumpHelper {
       }
     }
 
-    // Re-sort by DUCET collation to match the content endpoint's ICU sort order.
     entries.sort((a, b) => ducetCompare(a.letter, b.letter));
     if (descending) {
       entries.setAll(0, entries.reversed.toList());
     }
 
-    // Build cumulative index map in the corrected order.
     final letters = <String>[];
     final letterToIndex = <String, int>{};
     int cumulative = 0;