Transition

[jaco777thomas]

Add some transition effect when the text changes

[beniza]

User Story

Description
When subtitle text changes on screen, the switch is abrupt with no visual effect.

As a video editor, I want transition effects applied when subtitle text changes so that my videos feel polished and visually engaging.

Acceptance Criteria

• A transition effect (e.g. fade, slide, dissolve) plays between subtitle text changes
• The user can select from at least one transition style
• Transitions render correctly in the exported video