more organization

src/bg_shader.py

@@ -1,10 +1,12 @@
 # src/bg_shader.py
 import time
 import math
-from typing import Optional
 import numpy as np
+
+from typing       import Optional
 from imgui_bundle import imgui, nanovg as nvg, hello_imgui
 
+
 class BackgroundShader:
  def __init__(self):
   """