space: force dark theme (light mode looks bad)

app.py

@@ -1239,11 +1239,23 @@ That's the project's central constraint and its main flex on AMD's headline GPU.
 """
 
 
+FORCE_DARK_JS = """
+() => {
+    const url = new URL(window.location);
+    if (url.searchParams.get('__theme') !== 'dark') {
+        url.searchParams.set('__theme', 'dark');
+        window.location.href = url.href;
+    }
+}
+"""
+
+
 def build_ui():
     with gr.Blocks(
         theme=gr.themes.Base(primary_hue="violet", secondary_hue="pink",
                              neutral_hue="slate"),
         css=CUSTOM_CSS,
+        js=FORCE_DARK_JS,
         title="StudioMI300",
     ) as demo:
         gr.HTML(HERO_HTML)