Bug: Cocoa `SIGINT` handler uses shutdown path that doesn't allow Python's `atexit` to run

[mikez]

I asked an LLM agent to summarize the issue, including providing an example to reproduce.

System: macOS, Cocoa.

import atexit

import webview


def proof():
    with open("/tmp/atexit_proof.txt", "w") as f:
        f.write("atexit ran")


atexit.register(proof)

window = webview.create_window("Test", html="<h1>Test</h1>")
webview.start()

Close via X → /tmp/atexit_proof.txt exists. Close via Ctrl+C → it doesn't exist.

Using Cocao, Ctrl+C terminates the app, but it terminates via NSApp().terminate_() at the Cocoa level, which never returns to Python. Compare this to the QT backend which calls _app.quit() — that exits the Qt event loop and returns control to Python, allowing normal shutdown.