feat(theme): Add Alert Pulsing effect for NERV theme

src/theme_nerv_fx.py

@@ -18,3 +18,21 @@ class StatusFlicker:
  def get_alpha(self) -> float:
   # Modulate between 0.7 and 1.0 using sin wave
   return 0.85 + 0.15 * math.sin(time.time() * 20.0)
+
+class AlertPulsing:
+ def __init__(self):
+  self.active = False
+
+ def update(self, status: str):
+  self.active = status.lower().startswith("error")
+
+ def render(self, width: float, height: float):
+  if not self.active:
+   return
+  draw_list = imgui.get_foreground_draw_list()
+  # sin(t) is between -1 and 1
+  # scale to 0 to 1: (sin(t) + 1) / 2
+  # multiply by (0.2 - 0.05) = 0.15 and add 0.05
+  alpha = 0.05 + 0.15 * ((math.sin(time.time() * 4.0) + 1.0) / 2.0)
+  color = imgui.get_color_u32((1.0, 0.0, 0.0, alpha))
+  draw_list.add_rect((0.0, 0.0), (width, height), color, 0.0, 0, 10.0)