refactor(theme): Introduce semantic theme layer and clean NERV cruft from gui_2.py

src/theme_2.py

@@ -10,7 +10,11 @@ Scale uses imgui.get_style().font_scale_main.
 
 from imgui_bundle import imgui, hello_imgui
 from typing import Any, Optional
+from contextlib import nullcontext
+from src import imgui_scopes as imscope
 import src.theme_nerv
+from src.theme_nerv import DATA_GREEN
+from src.theme_nerv_fx import CRTFilter, AlertPulsing, StatusFlicker
 
 # ------------------------------------------------------------------ palettes
 
@@ -239,6 +243,10 @@ _current_scale: float = 1.0
 _transparency: float = 1.0
 _child_transparency: float = 1.0
 
+_crt_filter = CRTFilter()
+_alert_pulsing = AlertPulsing()
+_status_flicker = StatusFlicker()
+
 # ------------------------------------------------------------------ public API
 
 def get_current_palette() -> str:
@@ -396,3 +404,20 @@ def get_tweaked_theme() -> hello_imgui.ImGuiTweakedTheme:
  # Sync tweaks
  tt.tweaks.rounding = 6.0
  return tt
+
+def ai_text_color() -> imgui.ImVec4:
+ """Returns DATA_GREEN if NERV is active, otherwise standard text color."""
+ if is_nerv_active():
+  return imgui.ImVec4(*DATA_GREEN)
+ return imgui.get_style().color_(imgui.Col_.text)
+
+def ai_text_style():
+ """Context manager for AI response text styling."""
+ return imscope.style_color(imgui.Col_.text, ai_text_color())
+
+def render_post_fx(width: float, height: float, ai_status: str, crt_enabled: bool) -> None:
+ """Updates and renders the alert and CRT filters."""
+ _alert_pulsing.update(ai_status)
+ _alert_pulsing.render(width, height)
+ _crt_filter.enabled = crt_enabled
+ _crt_filter.render(width, height)