Fix Gradio 5 mount error by moving theme/css to Blocks.

mount_gradio_app in Gradio 5 does not accept theme/css kwargs, causing startup failure on Space.

Made-with: Cursor

server/gradio_ui.py

@@ -352,9 +352,21 @@ def build_blocks(static_dir: Path) -> Any:
         )
         return suite_md, suite_json, sid, f"Session: `{sid}`"
 
+    font = gr.themes.GoogleFont("Plus Jakarta Sans")
+    mono = gr.themes.GoogleFont("JetBrains Mono")
+    theme = gr.themes.Soft(
+        primary_hue="indigo",
+        secondary_hue="slate",
+        neutral_hue="slate",
+        font=(font, "ui-sans-serif", "system-ui"),
+        font_mono=(mono, "ui-monospace", "monospace"),
+    )
+
     with gr.Blocks(
         title="SQL Debug Environment",
         analytics_enabled=False,
+        theme=theme,
+        css=GRADIO_CSS,
     ) as demo:
         gr.HTML(
             """
@@ -690,21 +702,10 @@ def mount_gradio(app: Any, static_dir: Path) -> Any:
     """Mount single-page Gradio at `/` (Space home) while API routes stay on the same app."""
     import gradio as gr
 
-    font = gr.themes.GoogleFont("Plus Jakarta Sans")
-    mono = gr.themes.GoogleFont("JetBrains Mono")
-    theme = gr.themes.Soft(
-        primary_hue="indigo",
-        secondary_hue="slate",
-        neutral_hue="slate",
-        font=(font, "ui-sans-serif", "system-ui"),
-        font_mono=(mono, "ui-monospace", "monospace"),
-    )
     blocks = build_blocks(static_dir)
     return gr.mount_gradio_app(
         app,
         blocks,
         path="/gradio",
-        theme=theme,
-        css=GRADIO_CSS,
         allowed_paths=[str(static_dir.resolve())],
     )