daiqingshuang 358162415b feat: Add post-processing effects and canvas widget ...

- Implemented a fullscreen quad vertex shader for post-processing effects.
- Added a noise fragment shader to apply noise effects to textures.
- Created a vignette fragment shader for darkening corners of the screen.
- Developed a canvas widget to manage child widgets with anchor points and flexible sizing.
- Introduced an effect chain widget to apply multiple post-processing effects in sequence.
- Added overlay widget to position child widgets with alignment and padding options.
- Implemented a post effect widget to apply effects like blur, vignette, and color adjustments to child widgets.
- Provided convenience functions for easily applying common effects to widgets.

2025-11-27 09:52:00 +08:00

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