Center bounce animation by adjusting offset range

[Copilot]

The bounce animation was visually misaligned—appearing too low with the top of the bounce at what should be the center position.

Root cause

bounceOffset ranged from 0 to 50, causing unidirectional downward motion instead of symmetric oscillation around center.

Changes

Shifted offset range from [0, 50] to [-25, 25] by subtracting half the amplitude:

// Before: offset only went down (0 to 50)
bounceOffset = MathF.Abs(MathF.Sin(animationTime * 3)) * 50;

// After: offset oscillates symmetrically (-25 to 25)
bounceOffset = (MathF.Abs(MathF.Sin(animationTime * 3)) * 50) - 25;

Ball now bounces symmetrically around its starting position rather than only below it.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Bounce animation demo is misaligned</issue_title>
<issue_description>I think this should be adding half of the offset as currently it is too low and it looks like the top of the animation is where the middle of the animation would be.

Originally posted by @Damon3000s in #132 (comment)
</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Bounce animation demo is misaligned #134

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Note

Centers the bouncing animation by adjusting bounceOffset to oscillate symmetrically around zero (-25 to 25).

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