Replace the full-screen slide-down sheet with two fade-in cards
anchored to the top corners. Quick settings sit top-right,
notifications top-left capped at 60% screen height. Background
scrim reduced to 30%. Redundant clock header and status bar
hidden since both are already visible in the top panel.
REUSE CI requires copyright and license info on every file.
CHANGELOG, README, and the two Shift screenshots are original
work, licensed under EUPL-1.2.
