fix: confirm window closing in the session switcher

[lippdev]

Closing a window from the session switcher previously sent the close request immediately. Mouse, controller and Delete now open a confirmation showing the target title, with Cancel focused initially. Cancel/B/Escape returns focus to the target; confirming sends the normal close request so application save prompts still work. Keyboard and controller navigation remain inside the modal.

Validation: 285 unit tests passed; Windows Release x64 build passed for the identical preview tree. Portuguese manual checks cover cancellation, confirmation and unsaved documents. Physical controller interaction remains a manual check.

[pullfrog]

Important

Confirmation can leave the session switcher without a valid focus target when the app keeps the window open for a save prompt.

Reviewed changes The review covers the confirmation flow, localized strings, focus/input routing, and accompanying manual checks.

• Close confirmation Adds a modal confirmation for controller, keyboard, and per-card mouse close actions.
• Localized UI and manual checks Adds confirmation text in all supported locales and documents the expected cancellation, confirmation, and unsaved-document behavior.

  ^{｜ Fix all ➔ ｜ Fix 👍s ➔ ｜ View workflow run ｜ Using GPT Luna ｜ 𝕏}

[pullfrog]

✅ No new issues found.

Reviewed changes The incremental review covers the focus restoration changes after confirming or cancelling a window close.

• Restore focus after confirmation Focuses the target card as the confirmation overlay closes, then moves focus to the surviving card or its neighbor after the close request completes.

  ^{｜ View workflow run ｜ Using GPT Luna ｜ 𝕏}