feat: add GLSL shader transpilation setting

[kpal81xd]

Fixes #1320

What's Changed

• add an optional GLSL shader transpilation project setting beneath WebGPU
• preserve explicit values and safely migrate legacy projects from their effective WebGPU state
• load compiler URLs only when WebGPU and transpilation are both enabled

Checks

• I confirm I have read the contributing guidelines

Manual Smoke Test

1. Open a legacy WebGPU project without the setting; expect the transpilation toggle to be enabled and remain enabled after reload.
2. Create a project and enable WebGPU; expect GLSL shader transpilation to remain disabled by default.
3. Disable and re-enable WebGPU after enabling transpilation; expect the child toggle to hide and then restore its stored value.
4. Launch with transpilation disabled, then enabled; expect no compiler requests when disabled and all glslang/twgsl resources to load when enabled.

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Project	Deployment	Actions	Updated (UTC)
editor	Ready	Preview	Aug 18, 2026 10:26am