feat: Finalize Slint window shell lifecycle (toph-gui v0.4.0) - Keep a strong AppWindow handle so the tray can reopen the same window - Configure close requests to hide the window instead of exiting or destroying it - Mark the Slint shell frameless at the spec size Verification: cargo build; cargo test
$ koh steal kepr.uk/toph@c35de8b36bf2
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parent: dffed7