yoda: fork pivot — Wayland-only + ungate winit + soft-fork libcosmic-yoda (squashed)

Squash of 7 yoda commits forming the fork pivot:
- 255cf7cc rename: libcosmic -> libcosmic-yoda (fork 0.1.0-yoda)
- 8701aa31 feat(yoda): Wayland-only cut — drop winit and x11 features
- 6736a596 yoda: soft-fork pivot — keep Cargo name 'libcosmic' for dep unification
- 3e23d087 yoda: re-apply hard rename — libcosmic -> libcosmic-yoda (0.1.0-yoda)
- aec3eb61 yoda: ungate remaining winit+wayland combined cfgs
- 8ab7b158 yoda-v2: color_picker Theme ref + context_menu/menu ungate winit
- 8d1d8739 yoda: drop x11 defaults on iced_winit + iced_tiny_skia

i18n/ja/libcosmic.ftl

@@ -1,8 +0,0 @@
-close = 閉じる
-license = ライセンス
-links = リンク
-developers = 開発者
-designers = デザイナー
-artists = アーティスト
-translators = 翻訳者
-documenters = ドキュメント作成者