[Android] Keep video controls visible while seeking

[chassidysandraik-hash]

Goal

Fix Android DM video seeking: keep controls visible while dragging the progress bar.

Problem

On Android, dragging the video progress bar causes the controls to fade out/disappear mid-gesture, preventing seeking.

Solution

• Track an isSeeking state and short-circuit auto-hide while the progress bar is being dragged.
• Cancel any in-flight opacity animation and force controls visible on seek start.
• Resume the debounced auto-hide after seek ends (only when appropriate: playing, touchscreen, popover not visible).

Testing

• Android: Open a DM with a video attachment, play the video, drag the progress bar forward/backward and confirm the controls remain visible and the seek completes.
• iOS/Web: No behavior change expected.

$ #82026

PR Author Checklist

• I have read and followed the guidelines in the Contributing document.
• I have performed a self-review of my code.
• I have tested my changes and confirmed they work as expected.

Screenshots/Videos

N/A

[github-actions]

All contributors have signed the CLA ✍️ ✅
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[melvin-bot]

@mollfpr Please copy/paste the Reviewer Checklist from here into a new comment on this PR and complete it. If you have the K2 extension, you can simply click: [this button]

[chassidysandraik-hash]

I have read the CLA Document and I hereby sign the CLA

[chassidysandraik-hash]

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[chassidysandraik-hash]

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[chassidysandraik-hash]

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[chassidysandraik-hash]

The CLA check is now passing after signing — thanks. \n\nThe action is failing with a inside , even though the PR body includes an Author Checklist section with checked items.\n\nCould someone please advise what exact checklist header/format the action expects, or if this is a known workflow regression? Happy to adjust the PR description accordingly.

[chassidysandraik-hash]

The CLA check is now passing after signing — thanks.

The checklist action is failing with a TypeError: Cannot read properties of undefined (reading 'split') inside .github/actions/javascript/authorChecklist, even though the PR body includes an Author Checklist section with checked items.

Could someone please advise what exact checklist header/format the action expects, or if this is a known workflow regression? Happy to adjust the PR description accordingly.

[chassidysandraik-hash]

recheck