Add preflight popup validation for missing HF repo/token before crawl start

app.py

@@ -607,6 +607,17 @@ def validate_hf_requirements(enable_hf_upload: bool, hf_repo_id: str, hf_token:
         raise ValueError("HF token is required when upload is enabled.")
 
 
+def preflight_validate_start(
+    enable_hf_upload: bool,
+    hf_repo_id: str,
+    hf_token: str,
+) -> None:
+    if not bool(enable_hf_upload):
+        return
+    if not hf_repo_id.strip() or not hf_token.strip():
+        raise gr.Error("HF upload is enabled. Enter both HF Repo ID and HF Token first.")
+
+
 def build_crawler_config(
     *,
     seed_urls_input: Any,
@@ -1123,8 +1134,18 @@ def build_ui() -> gr.Blocks:
         ]
         outputs = [status_md, qvp_md, logs_box, token_widget_html]
 
-        start_button.click(start_crawl_standard, inputs=start_inputs, outputs=outputs)
-        super_button.click(start_crawl_super, inputs=start_inputs, outputs=outputs)
+        start_button.click(
+            preflight_validate_start,
+            inputs=[enable_hf_upload, hf_repo_id, hf_token],
+            outputs=[],
+            queue=False,
+        ).then(start_crawl_standard, inputs=start_inputs, outputs=outputs)
+        super_button.click(
+            preflight_validate_start,
+            inputs=[enable_hf_upload, hf_repo_id, hf_token],
+            outputs=[],
+            queue=False,
+        ).then(start_crawl_super, inputs=start_inputs, outputs=outputs)
         stop_button.click(stop_crawl, inputs=[], outputs=outputs)
         refresh_button.click(poll_dashboard, inputs=[], outputs=outputs)