Fix(linux): JIS key mapping

[ushinohama966]

Description

This PR adds missing mappings for Japanese (JIS) keyboard specific keys (Zenkaku_Hankaku, Hiragana_Katakana, Henkan, and Muhenkan) in raw_key_to_key for the GTK backend.

Without this mapping, pressing these keys on Linux environments causes them to fall back to Key::Unidentified, leading to unexpected behaviors or warning logs in frontend event handlers.

[github-actions]

Package Changes Through 0718d67

There are 1 changes which include tao with patch

Planned Package Versions

The following package releases are the planned based on the context of changes in this pull request.

package	current	next
tao	0.35.3	0.35.4

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[pewsheen]

Tested and looks good! Thanks!

[pewsheen]

@ushinohama966 Could you follow https://docs.github.com/en/authentication/managing-commit-signature-verification/signing-commits to sign your commit? otherwise we can't merge this PR.

[ushinohama966]

@pewsheen Thank you for the feedback!
I have updated the commits to be GPG/SSH signed as requested. I have also verified that all commits in this PR now have the "Verified" status.