sync: UI animations, select styling, TLS verify flag via proxy second line, brand spacing

agentui/common/cancel.py

@@ -0,0 +1,30 @@
+from __future__ import annotations
+
+from typing import Dict
+import threading
+
+# Simple in-process cancel flags storage (per pipeline_id)
+# Thread-safe for FastAPI workers in same process
+_cancel_flags: Dict[str, bool] = {}
+_lock = threading.Lock()
+
+
+def request_cancel(pipeline_id: str) -> None:
+    """Set cancel flag for given pipeline id."""
+    pid = str(pipeline_id or "pipeline_editor")
+    with _lock:
+        _cancel_flags[pid] = True
+
+
+def clear_cancel(pipeline_id: str) -> None:
+    """Clear cancel flag for given pipeline id."""
+    pid = str(pipeline_id or "pipeline_editor")
+    with _lock:
+        _cancel_flags.pop(pid, None)
+
+
+def is_cancelled(pipeline_id: str) -> bool:
+    """Check cancel flag for given pipeline id."""
+    pid = str(pipeline_id or "pipeline_editor")
+    with _lock:
+        return bool(_cancel_flags.get(pid, False))