Fixed
- History panel blocks all input - the backdrop window could get stuck capturing all clicks when the app lost focus (e.g. using Cmd+Shift+4 or a Sparkle update dialog appearing). The backdrop now auto-dismisses when the app deactivates, supports Escape key directly, and is torn down immediately on dismiss instead of waiting for the animation to complete.
- Share button not working - share picker panel was hidden behind the overlay window.