fix: prevent screen flickering on banner dismiss #439
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Fixed issue where screen briefly flickered after notification banner dismiss due to window level changes happening during animation. - deferred window level reset to next runloop - encapsulated elevate/reset logic in helper methods - removed redundant window level adjustments for in-VC banners
Changing windowLevel of the main UIWindow caused a brief screen redraw and visible flicker. - Moved banner rendering to a dedicated overlay window - Kept main window untouched to avoid layout and animation glitches
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Fixed issue where screen briefly flickered after notification banner dismiss due to window level changes happening during animation.