Fixed
- Linux/Wayland: local copies now detected on modern compositors.
Enabled arboard'swayland-data-controlfeature so the client uses a
native Wayland clipboard backend (via wl-clipboard-rs ≥ 0.9.2, which
supportsext-data-control-v1) instead of falling back to X11/XWayland.
Previously, text/images copied in native Wayland apps were never picked
up and published on compositors that expose onlyext-data-control-v1
and not the olderwlr-data-control-unstable-v1— e.g. current KDE
Plasma 6 — so sync worked one way (remote → local) but not the other
(local → remote). (#7)