feat(settings): reach the GUI via a Start-menu shortcut (Win11 fix)

[mkpoli]

Fixes your #1: "we still don't see GUI anywhere."

Root cause: on Windows 11 the floating language bar is hidden by default, so the langbar "設定 / Settings…" menu (#26) never appears — and TSF doesn't expose an "Options" button for third-party TIPs. So the settings dialog had no reachable entry point, even though config.toml works.

Fix — a Start-menu shortcut, independent of the language bar:

• Export ShowSettings (rundll32 CALLBACK signature) from the DLL → calls settings_dialog::show. Added to ainuKey.def; verified present in the cross-linked DLL's export table (5 exports now).
• Installer [Icons]: "ainuKey Settings" → rundll32.exe "<app>\ainukey.dll",ShowSettings.
• settings_dialog::show now SetForegroundWindow(dialog) so it pops to the front instead of opening behind the active window.

⚠️ Needs a Windows run to confirm rundll32 opens the dialog and the shortcut works. Build + export verified on Linux (cargo xwin + objdump).

Note: changing settings via this dialog (a separate rundll32 process) writes config.toml; the running IME picks it up on its next activation (switch away/back) — same as hand-editing the file.

Stacking note: the [Icons] addition is a different region of ainuKey.iss than #29's [Languages]/[Messages], so they should merge cleanly.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 387140f0-3e76-466b-b8cb-27acdb42be92

📥 Commits

Reviewing files that changed from the base of the PR and between 2dbb794 and c4bea94.

📒 Files selected for processing (4)

• ainuKey.def
• installer/ainuKey.iss
• src/lib.rs
• src/settings_dialog.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/settings-shortcut

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