Update app.py

app.py

@@ -12,6 +12,13 @@ try:  # pragma: no cover - spaces is only available inside HF Spaces
 except Exception:  # pragma: no cover - keep local dev working without spaces pkg
     spaces = None  # type: ignore
 
+if spaces:
+    @spaces.GPU(duration=60)  # short duration is enough
+    def __cinegen_gpu_warmup():
+        """Dummy function — never called, only exists to satisfy HF Spaces GPU detection"""
+        pass
+
+
 STYLE_CHOICES = [
     "Cinematic Realism",
     "Neo-Noir Animation",
@@ -36,10 +43,8 @@ def gpu_guard(duration: int = 120):
         if not spaces:
             return fn
         return spaces.GPU(duration=duration)(fn)
-
     return decorator
 
-
 def _character_dropdown_update(board: Storyboard | None):
     if not board or not board.characters:
         return gr.update(choices=[], value=None, interactive=False)