Updated entity interaction and game state

Significant changes include:
- Disabled input pickability for DeathBox in Dog entity
- Simplified mouse click detection logic in Snail script
- Removed unnecessary conditions and actions from snail eating state
- Adjusted cursor hotspot position for hand cursor in Cursor Manager
- Reset flower nectar level upon game reset

entities/Dog.tscn

@@ -117,6 +117,7 @@ libraries = {
 autoplay = "Highlight"
 
 [node name="DeathBox" type="Area2D" parent="."]
+input_pickable = false
 
 [node name="CollisionShape2D" type="CollisionShape2D" parent="DeathBox"]
 shape = SubResource("CircleShape2D_eyufl")