fix: third-person camera orbits player facing + robust animation handling

Third-person camera:
- Camera offset now follows player's forward direction using basis.z
- Smoothly orbits behind player when they turn
- Looks at player's head area (y+1.5)

SkinnedPlayerModel:
- Creates AnimationPlayer programmatically if GLB doesn't have one
- Copies animations from armature's animation_data to the player
- Handles both direct actions and NLA tracks
- More detailed debug output for scene tree and animation state

debug/test_level_builder.gd

@@ -748,11 +748,18 @@ func _process(_delta: float) -> void:
 	if not _player or not is_instance_valid(_player):
 		return
 
-	# Third person camera follow
+	# Third person camera follow — orbit behind player's facing direction
 	if _third_person and _third_person_camera and _third_person_camera.current:
-		var target_pos = _player.global_position + Vector3(0, 2.0, -4.0)
-		_third_person_camera.global_position = _third_person_camera.global_position.lerp(target_pos, 0.1)
-		_third_person_camera.look_at(_player.global_position + Vector3(0, 1.0, 0))
+		# Get the player's forward direction (on XZ plane)
+		var forward = -_player.global_transform.basis.z
+		forward.y = 0
+		forward = forward.normalized()
+		# Position camera behind and above player
+		var cam_offset = forward * -4.0 + Vector3.UP * 2.5
+		var target_pos = _player.global_position + cam_offset
+		_third_person_camera.global_position = _third_person_camera.global_position.lerp(target_pos, 0.12)
+		# Look at player's head area
+		_third_person_camera.look_at(_player.global_position + Vector3.UP * 1.5)
 
 	if _debug_ui_panel:
 		_debug_ui_panel.visible = SettingsManager.show_debug_ui