Remove unused method CountIdsInRange

AoC_2025/Day05.cs

@@ -70,11 +70,6 @@ public class Day05 : IPuzzleSolver<long>
         return range.from <= id && range.to >= id;
     }
 
-    private long CountIdsInRange(long from, long to)
-    {
-        return to - from + 1;
-    }
-
     private long SumIdsInRanges(IEnumerable<Range> ranges)
     {
         var sumFreshIds = 0L;