Silence Gradio 6.0 css/head deprecation warning

We pass css/head to gr.Blocks rather than launch() on purpose: running
via `gradio app.py` (hot-reload) ignores the __main__ launch() call, so
moving them there would drop our CSS and head scripts. Filter just that
one UserWarning.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

app.py

@@ -2,9 +2,20 @@ from __future__ import annotations
 
 import tempfile
 import math
+import warnings
 from pathlib import Path
 from typing import Any
 
+# css/head are intentionally passed to gr.Blocks rather than launch(): we run
+# via `gradio app.py` (hot-reload), which ignores the __main__ launch() call,
+# so moving them there would drop our CSS and head scripts. Silence the Gradio
+# 6.0 deprecation notice about that.
+warnings.filterwarnings(
+    "ignore",
+    message=r".*parameters have been moved from the Blocks constructor.*",
+    category=UserWarning,
+)
+
 import gradio as gr
 import numpy as np
 from PIL import Image, ImageDraw, ImageFont