Fixes:
```
Traceback (most recent call last):
File "/home/user/code/electrum-fork/electrum/plugins/psbt_nostr/qt.py", line 149, in on_receive
self.mark_pending_event_rcvd(event_id)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^
File "/home/user/code/electrum-fork/electrum/plugins/psbt_nostr/psbt_nostr.py", line 254, in mark_pending_event_rcvd
self.pending.set()
~~~~~~~~~~~~~~~~^^
File "/usr/lib64/python3.14/asyncio/locks.py", line 192, in set
fut.set_result(True)
~~~~~~~~~~~~~~^^^^^^
File "/usr/lib64/python3.14/asyncio/base_events.py", line 829, in call_soon
self._check_thread()
~~~~~~~~~~~~~~~~~~^^
File "/usr/lib64/python3.14/asyncio/base_events.py", line 866, in _check_thread
raise RuntimeError(
"Non-thread-safe operation invoked on an event loop other "
"than the current one")
RuntimeError: Non-thread-safe operation invoked on an event loop other than the current one
```
f321x
0d380218a6