Numerous refinements to the new mobileform setting pages
- Ensure left and right padding at the top level is 0 for mobile
- Centre align the avatar in the account editor page and add tooltip to button
- Fix the bubble/compact mode setting so that it fits when thin, i.e on mobile
- Fix the loading placeholder in device settings
As description, also note that the edit device name is now an inline element rather than an overlay.
Normal

Editing Name

This add the final list of settings in the main setting window as a new page notifications as there are quite a few now. This completes previous work on push rules giving the ability to set the default global rules. Adding keyword rules is also now supported.
This also uses the new mobileform layout. The settings are designed to give some visual feedback as options for whether notifications are on/off, play a sound or are highlighted are chosen. The left icon is designed to mimic the notification dot in the roomlist. The whole mobileform delegate can also be clicked to cycle through the available options.
The rationale for whether an option is available is as follows:
- Highlight is not available if would lead to every message in a room being highlighted
- Keyword notifications cannot be switched off instead the rule is just deleted
- Only keyword rules can be deleted, default rules cannot be touched
There is also rules plumbed in for features that don't exist in neochat yet, i.e. encrypted chats and rooms, calls. I figured I may as well plumb these in and test them my plan was to hide them before merge, they can then be unhidden when the features are complete.

Resolve https://invent.kde.org/network/neochat/-/issues/547
This patch attempts to add proxy config support to NeoChat so people could set a HTTP or Socks5 proxy for anonymity or privacy/censorship-circumvention reason.
Currently this will only allows setting proxy type, host and port (which should be usable for most of the cases). Settings in that page needs to be applied by clicking the Apply button so the proxy setting won't accidentally get changed.
Proxy is disabled (use System Default option) by default.