[pull] dev from plotly:dev - #525
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ThreadedRunner.stop() only had a graceful shutdown branch for FastAPI (keyed on `_uvicorn_server`). A Quart app fell through to the kill-based branch, which injects an async SystemExit via thread.kill() and then calls join() with no timeout. The server thread is parked in a blocking syscall (IOCP on Windows, epoll on POSIX), so the SystemExit is not delivered promptly and join() can hang indefinitely -- on Windows and Linux alike. Add a Quart branch that signals the backend's existing cooperative shutdown switch (backend._ws_shutdown_event) thread-safely on the server's own loop via call_soon_threadsafe, then joins bounded by stop_timeout. Flask/other backends keep the kill path unchanged.
Add a dash.testing regression test that starts a Quart app on ThreadedRunner and asserts stop() returns bounded by stop_timeout (run under a watchdog so a regression fails fast instead of wedging the suite). Verified it fails against the unpatched stop() and passes with the fix.
Add websocket_max_workers and run async callbacks directly on the loop
…graceful-shutdown Bugfix: Fix quart threadedrunner stop graceful shutdown
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