TSL: Show shader stage in debug() message

[sunag]

Related issue: #30797

Description

Show shader stage in debug() message.

[Copilot]

Pull Request Overview

This PR improves the debug output by including the shader stage information in the debug message.

• Introduces a new title incorporating the shader stage.
• Generates a dynamic border that matches the title’s length.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	336.36 78.34	336.36 78.34	+0 B +0 B
WebGPU	532.9 148.08	532.94 148.11	+48 B +29 B
WebGPU Nodes	532.36 147.98	532.41 148	+48 B +29 B

🌳 Bundle size after tree-shaking

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

	Before	After	Diff
WebGL	465.37 112.21	465.37 112.21	+0 B +0 B
WebGPU	604.53 164.05	604.58 164.08	+48 B +29 B
WebGPU Nodes	559.52 153.5	559.57 153.53	+48 B +29 B