Two bugs from the first on-device run.
The card sized itself from a layout it also centered, which resolved to zero, so
mask claimed a zero-size input region: the chip painted but no tap landed. Card
now sizes from the layout's implicit size and the background is a plain Item
child, not layout-managed.
wl-paste --watch replays the existing selection on start, so every watcher
restart (every unlock) resurrected a stale selection that could never be cleared
because the primary buffer never changed again. The first emission after a start
now only sets the baseline, and a dismissed selection is remembered so a re-read
cannot revive it.
Verified on blueline that Hyprland advertises primary-selection plus both
data-control managers, so wl-paste --primary --watch sees every selection with
no per-app hooks. Settles TASK-18's selection-detection question as
compositor-level; viewtop is not needed.
The protocol gives no selection rectangle, so anchor is the pointer position at
selection time. Opt-in by default: the watcher observes every highlight on the
device, including passwords, so it is killed while locked and selection text is
never persisted, logged, or trailed.
