TextureNode: Add .blur() check and warning

[sunag]

Closes: #30704

Description

Add .blur() check and warning.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	336.02 78.26	336.02 78.26	+0 B +0 B
WebGPU	520.4 145.06	520.65 145.16	+250 B +96 B
WebGPU Nodes	519.87 144.96	520.12 145.05	+250 B +94 B

🌳 Bundle size after tree-shaking

Minimal build including a renderer, camera, empty scene, and dependencies.

	Before	After	Diff
WebGL	465.06 112.14	465.06 112.14	+0 B +0 B
WebGPU	590.78 160.69	591.04 160.79	+258 B +101 B
WebGPU Nodes	545.91 150.13	546.17 150.23	+258 B +98 B

[Makio64]

Thanks 🙏