Codegen improvements

[mahkoh]

No description provided.

[Copilot]

Pull request overview

This PR updates the codegen crate to centralize/standardize how generated Rust files are written and formatted, and refreshes the checked-in generated keycode/input-event-code tables accordingly.

Changes:

• Introduces a small write-helper macro (define_w!) and refactors generators to use it consistently.
• Updates update() to format generated output via rustfmt before writing, and switches generators to pass relative output paths.
• Rewrites generated keycode/input-event-code mapping files to match the new formatting output.

Reviewed changes

Copilot reviewed 6 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
toml-config/src/config/keycodes/generated.rs	Regenerated keycode mapping with updated formatting/import style.
toml-config/src/config/input_event_codes/generated.rs	Regenerated input-event-code mapping with updated formatting/import style.
codegen/src/main.rs	Adds write-helper macro and updates update() to run rustfmt on output before writing.
codegen/src/keysyms.rs	Uses new write-helper and switches to relative output path.
codegen/src/input_event_codes.rs	Uses new write-helper and switches to relative output paths for all generated outputs.
codegen/codegen.sh	Removes separate cargo +nightly fmt step since formatting is now handled inside update().
codegen/Cargo.toml	Adds tempfile dependency for formatting via a temp file.
Cargo.lock	Locks new dependency additions (tempfile and transitive deps).

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