xkb: implement VoidAction

[mahkoh]

No description provided.

[Copilot]

Pull Request Overview

This pull request adds support for VoidAction in the xkb processing by introducing a new ResolvedVoidAction type and integrating it across the xkb action evaluation and diagnostic systems. Key changes include:

• Adding the ResolvedVoidAction struct and enum variant in kbvm/src/xkb/resolved.rs.
• Updating generated meanings, diagnostics, and error handling to accommodate VoidAction.
• Mapping ResolvedVoidAction in action processing and adding associated test cases.

Reviewed Changes

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

Show a summary per file

File	Description
kbvm/src/xkb/resolved.rs	Adds ResolvedVoidAction field in ActionDefaults and a new enum variant in ResolvedAction.
kbvm/src/xkb/meaning/generated.rs	Introduces a new Meaning variant for VoidAction and updates mappings accordingly.
kbvm/src/xkb/keymap/from_resolved.rs	Maps ResolvedVoidAction to an Action using a ControlsLock with default values.
kbvm/src/xkb/kccgst/expr.rs	Adds EvalError and ActionParameters implementation for VoidAction.
kbvm/src/xkb/diagnostic.rs	Adds a new diagnostic variant and example for UnknownParameterForVoidAction.
generator/src/xkb.rs	Updates string array and constant length to include VoidAction.
compile-tests/…/input.xkb & expected.xkb	Adds a test case for a key with a VoidAction.