feat: Make prepareDispatch withable

[aleksanderkatan]

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[Copilot]

Pull Request Overview

This PR modifies the prepareDispatch function to return a PreparedDispatch class instance instead of directly returning a dispatch function. The key enhancement is making prepared dispatches "withable" by adding support for binding different bind groups to the same dispatch pipeline.

• Introduces a new PreparedDispatch class that wraps the dispatch functionality and adds a with() method
• Updates the return type of prepareDispatch to return PreparedDispatch<TArgs> instead of DispatchForArgs<TArgs>
• Modifies all existing usage to call .dispatch() on the returned object instead of calling the function directly

Reviewed Changes

Copilot reviewed 6 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packages/typegpu/src/prepareDispatch.ts	Core implementation adding PreparedDispatch class and with() method
apps/typegpu-docs/src/examples/tests/log-test/index.ts	Updates all prepareDispatch calls to use .dispatch()
apps/typegpu-docs/src/examples/tests/dispatch/index.ts	Updates calls and adds new test for bind group functionality
apps/typegpu-docs/src/examples/rendering/3d-fish/index.ts	Updates variable naming and dispatch call
apps/typegpu-docs/src/content/docs/fundamentals/utils.mdx	Updates documentation to reflect new API
packages/typegpu/tests/examples/individual/dispatch.test.ts	Updates test expectations for generated WGSL

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[iwoplaza]

Looks good! 🫡