fix: correct streak offset validation to allow .5 decrements (@Chaitanya-Keyal)

[Chaitanya-Keyal]

Description

The current streak hour offset validation fails for values like -5.5 because -5.5 % 1 evaluates to -0.5, causing the fractional check to fail.

This PR simplifies the validation logic by multiplying the value by 2 and checking whether the result is an integer. This correctly allows only whole-hour and half-hour (.5) offsets while handling negative values properly.

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Closes #7204, related PRs #7269, #7362

[Copilot]

Pull request overview

This PR fixes a validation bug in the streak hour offset modal that incorrectly rejected negative half-hour values (e.g., -5.5). The issue occurred because the modulo operation on negative decimal numbers produces negative results (e.g., -5.5 % 1 = -0.5), which the original validation logic didn't handle correctly.

Changes:

• Simplified validation logic from checking value % 1 !== 0 && value % 1 !== 0.5 to (value * 2) % 1 !== 0
• Added a clarifying comment explaining the new validation approach

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