wl_keyboard: cleanup

[mahkoh]

No description provided.

[Copilot]

Pull request overview

This PR refactors the WlKeyboard struct to store client and version fields directly instead of accessing them through the seat field. This is a cleanup that reduces indirection and simplifies the code.

• Adds client and version fields to WlKeyboard struct, initialized from the parent seat
• Updates all methods to access client and version directly instead of through self.seat
• Changes method signatures from &self to self: &Rc<Self> where needed

Reviewed changes

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

File	Description
src/ifs/wl_seat/wl_keyboard.rs	Adds client and version fields to WlKeyboard, updates method signatures, and replaces self.seat.client/self.seat.version with direct field access
src/ifs/wl_seat/zwp_virtual_keyboard_v1.rs	Updates for_each_kb closure signature to accept &Rc<WlKeyboard> instead of &WlKeyboard to match new method signatures

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