Investigate screen recording edge artifacts

[richiemcilroy]

Fixes white lines around screen recordings by preventing semi-transparent edges when no rounded corners are applied.

When rounding_px was 0, the apply_rounded_corners function's smoothstep anti-aliasing produced ~50% coverage at the exact edge pixels, causing background bleed-through. This change ensures straight edges remain fully opaque when no rounding is intended.

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✨ Finishing touches

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