Fix focus-down regression when pointer warp disabled

[cnharrison]

Summary

• fix the regression where the “focus down” action can no longer reach a tiled window on the secondary monitor when the pointer is parked on the primary monitor
• keep focus hotkeys working across monitors even when “Move pointer with focus” is disabled
• only warp the cursor when either the setting is enabled or focus crosses to a different monitor, so same-monitor focus changes keep the pointer steady

Impact

• users running multi-monitor setups on Wayland with pointer warp disabled regain reliable cross-monitor focus navigation without reintroducing pointer jumps

Testing

• GNOME 46.3 (Wayland)
• Move pointer with focus disabled
• Focus down action now reaches a tiled window on the secondary display while the pointer remains stationary

[juarezr]

I'm testing this.
Found no issues, so far.