impr: Error messages for invalid array and tgpu.const usage

[aleksanderkatan]

Changes:

• better error when indexing an external array with a runtime index,
• better error when using a const inside TGSL.

[github-actions]

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[Copilot]

Pull Request Overview

This PR enhances error messages in the WGSL generator to provide clearer guidance when developers encounter common mistakes. The changes improve developer experience by replacing generic error messages with actionable instructions.

Key Changes:

• Enhanced error message for indexing external arrays with runtime indices to suggest three alternative approaches
• Added validation to detect and prevent tgpu.const declarations within GPU function scope with clear remediation steps

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
packages/typegpu/src/tgsl/wgslGenerator.ts	Updated error messages for array indexing and added validation for const declarations
packages/typegpu/tests/tgsl/wgslGenerator.test.ts	Added test cases verifying the new descriptive error messages

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[iwoplaza]

Awesome changes! 👏

[iwoplaza]

Could you change the name of the PR slightly to describe in more detail what errors were improved? This will make it easier to generate change notes