feat: voortgang delete in headerbar

webui/backend/app/db/task_repository.py

@@ -7,7 +7,7 @@ from datetime import datetime, timezone
 from pathlib import Path
 
 VALID_STATUSES = {"queued", "running", "completed", "failed", "requested", "preparing", "ready", "cancelled"}
-VALID_OPERATIONS = {"copy", "move", "download", "duplicate"}
+VALID_OPERATIONS = {"copy", "move", "download", "duplicate", "delete"}
 NON_TERMINAL_STATUSES = ("queued", "running", "requested", "preparing")
 TASK_MIGRATION_COLUMNS: dict[str, str] = {
     "operation": "TEXT NOT NULL DEFAULT 'copy'",