Running a tool from the Tools tab raised two full-size toasts around a few
seconds of work — "task started!" as the run began and "task completed!" as
it ended — and then opened the result modal that actually carried the answer.
The started one was stale by the time it was read and the finished one said
what the modal was already showing.
Tool tasks now go through LP_BACKGROUND_TASKS with a new `silent` flag (no
started toast, no finish line), and tools-manager raises a compact
"Running <tool>…" spinner toast for the duration instead, dismissed the
moment the result modal or the user list opens.
A failed list_users now falls through to the result modal too — it has no
account list to open, and the completion toast that used to report the
failure is gone.
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