FIXED: Bug where max island progress would decrease when island level should be negative

[msmith-codes]

This pull request improves the calculation of points accumulated within the current level in the tidyUp() method of IslandLevelCalculator.java. The main change is a more robust handling of level-0 islands to prevent negative progress and calculation errors, especially for new islands or when block counts drop below the starting count.

Calculation logic improvements:

• For level-0 islands, the calculation now anchors progress to the initial block count (minBlocks), preventing negative or misleading progress values and avoiding unsafe searches that could result in NaN or incorrect values due to the behavior of calculateLevel with negative inputs.
• For islands above level 0, the binary search for points from the current level remains, but the result is now consistently assigned to lowerBlocks for use in the points calculation. [1] [2]
• The assignment to results.pointsFromCurrentLevel is updated to use blockAndDeathPoints - lowerBlocks, ensuring correct progress reporting for all cases.

[msmith-codes]

I'm not getting this build failed error on my local build. I'll take a further look to see if there was any oversight.