feat(edit-clip): play the kept range, scrub it, and preview trim frames

[prayaslashkari]

• A play/pause button plays the kept range with the file's own audio and stops at the out-point; played again from there, it starts over.
• A playhead on the trim bar; a click or drag on the bar scrubs, held inside the kept range.
• Space plays and pauses, the arrows step a frame (a second with Shift).
• A held trim handle shows its own frame, and letting go returns the picture to the playhead.

Summary

Related issue

Fixes #

Type of change

• Bug fix
• Feature
• Enhancement
• Documentation
• Refactor / maintenance
• Performance
• Security

Release impact

• Patch
• Minor
• Major / breaking change
• No release note needed

Desktop impact

• Windows
• macOS
• Linux
• Installer / packaging
• Not platform-specific

Screenshots / video

Screen.Recording.2026-09-29.at.12.34.47.AM.mov

Testing

[coderabbitai]

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