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[Bug] Timeline tracks can be dragged into negative timestamps (< 0s) #55

Description

@zack-the-worker

On the editor timeline, users are able to drag and reposition media tracks (video, audio, text) to the left of the 0-second mark, causing the start time to register as a negative value.

Steps to Reproduce:
Open the Editor app and create a new project.Import and add any media asset (video/audio) to the timeline.Drag the track firmly to the left, past the starting point (00:00).Observe the track position and timecode.Actual Result:The track moves past the zero barrier, and the timecode displays a negative value (e.g., -00:02).

Expected Result:
The 0-second mark should act as a hard boundary. Tracks should be locked and unable to be dragged into negative time.

Severity: High (May cause rendering or exporting failures).

Screencast:

Screen.Recording.2026-09-03.at.21.57.10.mov

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