fix: create gr.State inside Blocks (KeyError on load) + module-level demo

app.py

@@ -225,9 +225,11 @@ def _find(flows, company, period, stmt):
 
 # ── App ───────────────────────────────────────────────────────────────────────
 def build_app():
-    state = gr.State(_demo_flows())
-
-    with gr.Blocks(title="Financial Sankey Explorer", theme=gr.themes.Soft()) as demo:
+    with gr.Blocks(title="Financial Sankey Explorer") as demo:
+        # State MUST be created inside the Blocks context so it is registered
+        # (a State created outside has an unregistered id → KeyError on every
+        # callback that reads it, including the on-load).
+        state = gr.State(_demo_flows())
         gr.Markdown(
             "# 💸 Financial Sankey Explorer\n"
             "Multi-step funds-flow view of synthetic financial statements from "
@@ -284,5 +286,8 @@ def build_app():
     return demo
 
 
+# Module-level `demo` so the HF Spaces launcher auto-detects it.
+demo = build_app()
+
 if __name__ == "__main__":
-    build_app().launch()
+    demo.launch()