Fix keyboard input not working on Windows client

Added explicit window focus grab after connecting (lan-bootstrapper.gd)
so keyboard input is properly received by the input system.
Also added diagnostic debug prints to trace input pipeline.

examples/multiplayer-fps/scripts/player.gd

@@ -123,21 +123,30 @@ func _after_tick_loop():
 func _process(_delta: float):
 	if not _is_local:
 		if input.is_multiplayer_authority():
+			print("[PLAYER DEBUG] First _process — calling _setup_local_camera (authority: %d)" % multiplayer.get_unique_id())
 			_setup_local_camera()
 		else:
+			print("[PLAYER DEBUG] _process skipping — input not authority (unique_id=%d, input_auth=%d)" % [multiplayer.get_unique_id(), input.get_multiplayer_authority()])
 			return
-
+	
 	# Smooth position interpolation between ticks
 	var f := NetworkTime.tick_factor
 	global_position = _lerp_from_pos.lerp(_lerp_to_pos, f)
-
+	
 	# Frame-rate mouse look (recoil only affects raycast, not camera)
+	var old_yaw = _sim_yaw
 	rotation.y = _sim_yaw + (-input.mouse_rotation.y)
+	if _sim_yaw != old_yaw or input.mouse_rotation.length_squared() > 0:
+		pass  # mouse look active
 	head.rotation.x = clamp(_sim_pitch + (-input.mouse_rotation.x), -1.57, 1.57)
 	head.rotation.y = 0
 	head.rotation.z = 0
 
 func _rollback_tick(delta: float, tick: int, is_fresh: bool) -> void:
+	# DEBUG movement state
+	if input and input.movement.length_squared() > 0:
+		print("[PLAYER RT] tick=%d movement=%s hp=%d death_tick=%d frozen=%s" % [tick, input.movement, health, death_tick, round_manager and round_manager.freeze_end_tick >= 0 and tick < round_manager.freeze_end_tick])
+
 	# Handle round respawn teleport inside rollback
 	if respawn_tick >= 0 and tick == respawn_tick:
 		global_position = respawn_position