bfcache not used because WebSocket connection is not closed

[dumdum7]

Describe the bug

When navigating to a different page and then going back, page should not refresh, and scroll position should restore. It currently doesn't due to bfcache not being used because of an open WebSocket connection. See https://web.dev/articles/bfcache#close-open-connections

I think fix should be fairly simple: call wsClient.dispose() on pagehide event, and create a new client on pageshow event.

Steps to reproduce

1. Go to Stash
2. Scroll down
3. Go to a different page, e.g. google.com
4. Go back with browser button
5. Page is refreshed, and scroll position is reset

Expected behaviour

Page should be retrieved from bfcache.

Screenshots or additional context

No response

Stash version

v0.30.1

Device details

Chrome on Windows

Relevant log output