✨ app can be minimized when close button click

[manusa]

Part of #44

Due to inconsistencies in the tray icon behavior across the platforms (Linux, Mac, Windows) and with the purpose of offering a smooth and exact behavior in all of them, the browser window needs to be minimized instead of hidden.

When hiding the window in Linux, there's no way to detect when the user clicks on the Tray to invoke the BrowserWindow.show() function. Depending on the user's X environment different things might happen.

To avoid all of this, with the current implementation, the window is just minimized which means it will remain visible in the task bar. Unless the underlying Electron's Tray implementation is changed in the future, there's nothing else that can be done if a consistent behavior across platforms wants to be preserved.

[sonarqubecloud]

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