[Feature]: After trimming a video, the UI should display the final duration of the video after the trim is applied #558

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Is your feature request related to a problem?

The trim controls allow the user to select a start/end portion of the video, but the resulting/final duration is not clearly shown after the trim

Describe the solution you'd like

Display the calculated final duration based on the selected trim range, for example:

Original duration: 02:35
Trim range: 00:20 – 01:45
Final duration: 01:25

The final duration should update immediately as the trim handles are adjusted, so users can see exactly how long the exported video will be.

Describe alternatives you've considered

No response

Additional context

Why this would be useful

This would make trimming much more precise and predictable, especially when users need to produce videos with a specific target duration. It also provides useful confirmation before exporting/saving the trimmed video.

Suggested UI

A small Final duration indicator near the trim controls/timeline would be sufficient. It could update in real time while the user adjusts either trim handle.

This seems like a relatively small UX improvement that would make the trimming workflow significantly clearer.