Debug: show row key and job IDs when kill fails to find job

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tui/screens/running_tasks.py

@@ -91,10 +91,11 @@ class RunningTasksScreen(Screen):
             self.notify("No jobs to kill", severity="warning")
             return
         row_key, _ = table.coordinate_to_cell_key(table.cursor_coordinate)
-        job_id = str(row_key)
+        job_id = str(row_key.value if hasattr(row_key, 'value') else row_key)
         job = job_manager.get_job(job_id)
         if not job:
-            self.notify("Job not found", severity="warning")
+            ids = [j.id for j in job_manager.list_jobs()]
+            self.notify(f"Not found: key={row_key!r} ids={ids}", severity="warning")
             return
         if job.status != "running":
             self.notify(f"Job already finished ({job.status})", severity="warning")