[cartpauj]

Closes #436

What

Clicking the window's X, pressing Alt+F4, or using Window → Close now asks before Ultra Tracker shuts down:

Are you sure you want to quit Ultra Tracker?
Your data is saved.
When Ultra Tracker is opened again, the RFID reader will need to be reconnected. ← only while an RFID reader is connected
Reconnect to OpenSplitTime when you reopen the app. ← only while signed in to OpenSplitTime
[Quit] [Cancel]

Cancel is the default and the cancel button, so Enter or Esc keeps the app open.

No prompt for deliberate quits:

• the updater's Restart and update, and Cmd+Q on macOS (both go through before-quit)
• Windows logging off or shutting down (session-end on the window), so the prompt never blocks a shutdown

How

• New src/main/lib/confirm-close.ts: confirmBeforeClosing(window) hooks the window's close event and uses a synchronous showMessageBoxSync, so a double-click on X can't stack two prompts
• The detail line checks GetRFIDStatus() and OpenSplitTime getAuthStatus() at the moment the prompt opens
• createWindow calls it for the main window
• README and in-app Help each get a sentence about the prompt

Tests

confirm-close.test.ts (9 tests): cancel keeps the window, quit calls app.quit, Cancel is the default, before-quit and session-end skip the prompt, and the detail wording with and without RFID and OST. index.test.ts checks the main window is wired up. The full src/main suite passes (813 tests).

The prompt and its wording were reviewed in the app. The RFID, OpenSplitTime, updater, and shutdown paths are covered by the tests only.

🤖 Generated with Claude Code