Improves scene lighting and tree collision

Moves light direction to global shader parameter, enabling dynamic light updates.

Adjusts tree collision shape for better player interaction.

Updates default season to summer.

project.godot

@@ -94,3 +94,7 @@ player_position={
 "type": "vec3",
 "value": Vector3(0, 0, 0)
 }
+light_direction={
+"type": "vec3",
+"value": Vector3(0, 0, 0)
+}