Move windows across monitors at root boundary

[OKlueck]

Summary

• make hy3:movewindow try the adjacent monitor when moving out of the root group
• follow focus to the moved window and warp the cursor to it, avoiding focus-follows-mouse switching back to the old monitor
• keep the existing split-wrapping fallback when there is no monitor in that direction

Why

hy3:movefocus already crosses monitor boundaries via focusMonitor(direction), but hy3:movewindow only wrapped the root node into a new split when it reached the workspace root boundary. On multi-monitor setups this made directional window moves stop at the monitor edge.

When input:follow_mouse is enabled, moving the window without warping the cursor can also leave the pointer on the old monitor and cause follow-up actions (for example closing with a keybind) to affect a different window. The monitor-crossing move now forwards the warp flag to moveNodeToWorkspace.

Testing

• Built locally with CMake/Ninja
• Replaced the hyprpm-loaded plugin locally and verified hy3:movewindow r moves a test window from DP-1/workspace 99 to DP-2/workspace 3