@remotion/studio: Remove splitter hover state

[JonnyBurger]

Summary

• keep the existing thin black Studio splitter dividers
• remove the blue hover and active splitter styles
• remove the redundant hover state listeners and class toggles

Testing

• bun run build
• bun run stylecheck

[vercel]

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Project	Deployment	Actions	Updated (UTC)
bugs	Ready	Preview	Jul 30, 2026 5:23pm
remotion	Ready	Preview	Jul 30, 2026 5:23pm

[pullfrog]

✅ No new issues found.

Reviewed changes — cosmetic simplification of Studio splitter handles: removed blue hover/active CSS styles, removed the hover-state tracking useEffect, and consolidated two-tier (unhovered vs active/hovered) CSS into single rules with the existing black gradient and 2x scale factor.

• SplitterHandle.tsx — removed classList.add/remove('remotion-splitter-active') calls from drag start/end, and removed the entire useEffect that managed mouseenter/mouseleave/mousedown/mouseup listeners for remotion-splitter-hover class toggling.
• inject-css.ts — merged unhoveredDragAreaFactor and hoveredDragAreaFactor into a single dragAreaFactor (2), removed the .remotion-splitter-active/.remotion-splitter-hover blue-gradient CSS rules on both horizontal and vertical variants, and dropped the z-index: 1000.

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