v0.2: kana/latin mode-switch language-bar button

[mkpoli]

Draft — needs Windows testing. Stacked on #1 (retarget to master after #1 merges).

Adds a language-bar button that toggles input mode:

• Kana (default): romaji → Ainu katakana.
• Latin: letters pass through unchanged (direct alphabet input).

Implementation

• src/lang_bar.rs: ModeButton implementing ITfLangBarItemButton + ITfLangBarItem + ITfSource; OnClick flips the mode and notifies the langbar sink (OnUpdate); GetIcon loads mode_kana/mode_latn by resource id.
• Mode is shared with the key handler via Rc<Cell<Mode>>; would_eat returns false for letters in Latin mode (passthrough).
• Button added in ActivateEx, removed in Deactivate.
• resources.rc now uses numeric ids (101/102/103); IDI_ICON stays icon index 0 (profile icon).

Verified here

cargo check + clippy + fmt green against windows 0.60.

Needs Windows check

Button appears in the language bar; clicking toggles the icon; Latin mode types raw letters; Kana mode still converts.

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[mkpoli]

Superseded — this branch is fully merged into integration (verified: git merge-base --is-ancestor passes) and shipped in the v0.2.x releases. It also targets a stale base branch. Closing to declutter; no code is lost. The reconciliation of integration into master is being handled separately.