bpkProgressiveBlur

Applies a progressive blur effect to the bottom half of the composable.

The blur starts at the vertical midpoint and increases towards the bottom edge, creating a visually appealing transition. This modifier uses a custom AGSL shader for optimal performance and appearance on supported Android versions (API 33+).

• The effect is clipped to the composable bounds.

• The blur strength and direction are handled via uniforms for two-pass chaining (X then Y).

• Falls back to a uniform blur on unsupported platforms.

This modifier is designed to be accessible and themable, following Backpack's component standards. It does not interfere with touch targets, semantics, or theming, and is compatible with both light and dark modes.