Fix sticky header visibility during animations

[AfzalivE]

Summary

• Calculate sticky-header anchor visibility using rendered bounds.
• Apply the correction to normal vertical and horizontal layouts.

Why

RecyclerView item animations lay moving headers out at their final coordinates and use translation to render them at their current position.

isViewValidAnchor() subtracted that translation from the view's bottom or right edge. This could reject a real header while it was still visible, causing the following item to become the anchor and creating a duplicate sticky header.

Using bottom + translationY and right + translationX aligns the visibility check with the header's rendered position without special-casing animation state or scanning additional children.

Testing

• Reproduced in Todoist Android by rescheduling the only overdue task to Today.
• Verified the transition keeps one Today header and the correct item ordering.

[doistbot]

This PR updates Fix sticky header visibility during animations. No issues were flagged in the reviewed diff.

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