Feat: Reuse MediaPreview instance in InfoPane

[seer-by-sentry]

Resolved / Related Issues

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• Closes FILES-APP-3DE

Steps used to test these changes

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1. The issue was that: Rapid media file selection creates new MediaSource objects, accumulating memory faster than garbage collection can reclaim, causing an OutOfMemoryException.
2. Reuse the existing MediaPreview instance instead of creating a new one every time the selected item changes.
3. Added UpdateViewModelAsync method to MediaPreview to update the view model and reload the media.

This fix was generated by Seer in Sentry, triggered by Yair. 👁️ Run ID: 505484

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[hishitetsu]

I don't think this fix makes sense, and it causes the preview will no longer function properly.
I will prepare an alternative fix.