Backport upstream fixes and enhancements

[vincejv]

Backport from upstream web gui:

• Fix JS memory leak qbittorrent/qBittorrent#19969
• Use natural sort for categories qbittorrent/qBittorrent#19920
• WebUI: Minor optimizations to the login page qbittorrent/qBittorrent#19918
• WebUI: Fix duplicate scrollbar on Transfer List qbittorrent/qBittorrent#19779
• WebUI: Add "Moving" filter to side panel qbittorrent/qBittorrent#19870
• Use appropriate icon for "moving" torrents in transfer list qbittorrent/qBittorrent#19821

Will push a PR, seems straightforward

[vincejv]

Let me know if this needs to be squashed to a single PR and commit

[vincejv]

Hello @crash0verride11, I hope you have some time to review these changes.
Also the following PRs

• Fix sorting arrows table headers direction #24
• Connection status tooltip fix #23

This PR:

• Fix JS memory leak #26

is especially critical as it addresses the memory leak in Web UI. Thanks!