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.

tests/check_actions.gd.uid

@@ -0,0 +1 @@
+uid://4mlr8ca8nlg7

tests/check_input_map.gd.uid

@@ -0,0 +1 @@
+uid://h5lroui7prfv

tests/check_models.gd

@@ -1,20 +0,0 @@
-#!/usr/bin/env -S godot --headless --script
-extends SceneTree
-
-func _init():
-	var paths = [
-		"res://assets/kenney/models/blaster.glb",
-		"res://examples/multiplayer-fps/models/knife.fbx",
-		"res://examples/multiplayer-fps/models/grenade.glb",
-	]
-	for p in paths:
-		var scene = load(p)
-		if scene:
-			var inst = scene.instantiate()
-			print(p, " -> type: ", inst.get_class(), " children: ", inst.get_child_count())
-			for c in inst.get_children():
-				print("   child: ", c.get_class(), " ", c.name)
-			inst.queue_free()
-		else:
-			print(p, " -> FAILED TO LOAD")
-	quit()