fix(api): keep file event streams alive

- Disable the Quart response timeout for authenticated file event streams.
- Send SSE keepalives more often to avoid idle proxy disconnects.
- Treat remote stream interruptions as reconnectable disconnects in watch output.
- Bump NanoShare to 1.26.0 and the standalone CLI to 0.4.1.

routes/api/events.py

@@ -37,7 +37,7 @@ async def api_file_events(user: dict):
     previous = await _snapshot(user_id)
     yield 'event: ready\ndata: {}\n\n'
     while True:
-      await asyncio.sleep(30)
+      await asyncio.sleep(15)
       current = await _snapshot(user_id)
       if current != previous:
         previous = current
@@ -45,7 +45,9 @@ async def api_file_events(user: dict):
       else:
         yield ': keepalive\n\n'
 
-  return Response(stream(), content_type='text/event-stream', headers={
+  response = Response(stream(), content_type='text/event-stream', headers={
     'Cache-Control': 'no-cache',
     'X-Accel-Buffering': 'no',
   })
+  response.timeout = None
+  return response