Fix CPU spike from library immersive mode blur#613
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Bake the background blur into the decoded bitmap once (quarter-res decode + box blur transformation) instead of re-running a fullscreen render effect every frame; also makes blur work below Android 12. Cache the shortcut list per refresh signal instead of rescanning containers on every focus move, and debounce focus changes 200ms so scrubbing the grid doesn't decode every intermediate hero image.
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Bake the background blur into the decoded bitmap once (quarter-res decode