docs(animation): add MAX_SAFE_INTEGER warning for large input edge case

[70928manson]

What this PR does

This PR adds a short comment to the JavaScript example in the animation guide, warning users about potential issues with large input values exceeding Number.MAX_SAFE_INTEGER.

Why

The current example uses tweening to animate a number input. However, if the input exceeds 2^53 - 1 (9007199254740991), JavaScript may no longer represent it precisely due to floating-point limitations. This note aims to clarify that it's an edge case and not an issue with the example itself.

Changes

• Add comment above watch block in the gsap example warning about Number.MAX_SAFE_INTEGER

Additional Notes

• Other language versions (e.g., zh-CN, zh-HK, ja) should also consider adding this comment for consistency. The change is currently only made in the English guide.

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