feat: implement explosive and homing projectile types for weapon system

weapons/explosive_projectile.gd

@@ -68,3 +68,25 @@ func _explode(pos: Vector3) -> void:
 				pass
 			else:
 				col.take_damage(final_damage, target_pos, owner_player)
+				
+	# Visual Effect
+	var visual = MeshInstance3D.new()
+	var s_mesh = SphereMesh.new()
+	s_mesh.radius = explosion_radius
+	s_mesh.height = explosion_radius * 2.0
+	visual.mesh = s_mesh
+	
+	var mat = StandardMaterial3D.new()
+	mat.albedo_color = Color(1.0, 0.5, 0.0, 0.6) # Translucent orange
+	mat.transparency = BaseMaterial3D.TRANSPARENCY_ALPHA
+	mat.emission_enabled = true
+	mat.emission = Color(1.0, 0.3, 0.0)
+	visual.material_override = mat
+	
+	visual.position = pos
+	get_tree().current_scene.add_child(visual)
+	
+	var tween = visual.create_tween()
+	tween.tween_property(mat, "albedo_color:a", 0.0, 0.3)
+	tween.parallel().tween_property(visual, "scale", Vector3(1.1, 1.1, 1.1), 0.3)
+	tween.tween_callback(visual.queue_free)

weapons/homing_projectile.gd

@@ -6,6 +6,11 @@ var turn_speed: float = 5.0
 
 func _physics_process(delta: float) -> void:
 	if is_instance_valid(weapon_source) and weapon_source.get("homing_target_pos") != null:
+		var is_painting = weapon_source.get("is_targeting")
+		if is_painting != null and not is_painting:
+			# Not painting target, just fly straight
+			pass
+		else:
 			var target: Vector3 = weapon_source.homing_target_pos
 			if target != Vector3.ZERO:
 				# Steer towards target