v0.2.1

fix(linux): overlay unclickable — never set type:'toolbar' on KWin

v0.2.0 applied type:'toolbar' on Linux to hide the window from Alt+Tab.
KWin treats toolbar-type windows as passive utility panels: the overlay
rendered but KWin stripped every input action (_NET_WM_ALLOWED_ACTIONS
reduced to MOVE + CHANGE_DESKTOP, no CLOSE, no focus) — users could not
click, type, or close it.

Reverted to Windows-only; Linux taskbar hiding stays on skipTaskbar
(_NET_WM_STATE_SKIP_TASKBAR), which KWin honors without touching input.
Verified via xprop: window is back to _NET_WM_WINDOW_TYPE_NORMAL with
the full action set including CLOSE.