Allow to disable auto saving for layout configs

[philippotto]

• implement functionality
• clean up UI

URL of deployed dev instance (used for testing):

• https://optionallayoutautosaving.webknossos.xyz

Steps to test:

• ensure that you have at least two layout presets
• disable auto-saving by clicking the "disconnect" item in the layout submenu (the tooltips don't work on the first hovers for me :/ antd is probably not meant for this combination of menu and tooltip)
• change the active layout (e.g., make a pane bigger)
• switch to the other layout
• switch to the changed layout (it should not contain the bigger pane)
• enable auto-saving and repeat the above steps (the layout change should survive the layout switching)

Issues:

• fixes Make auto-saving of layout changes optional #3592

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• Updated changelog
• Ready for review

[daniel-wer]

LGTM 🎉

the tooltips don't work on the first hovers for me :/ antd is probably not meant for this combination of menu and tooltip

I also thought that they didn't work for me on the first try, but they actually do! The problem seems to be that they only trigger when hovering over the icon, which is quite a bit smaller than the Menu.Item. I didn't find a nice way to add an Antd Tooltip to the Menu.Item, but you could think about adding a title attribute to the Menu.Item instead of using the Antd Tooltip. This way the tooltips will always be rendered :)

[philippotto]

[...] but you could think about adding a title attribute to the Menu.Item instead of using the Antd Tooltip.

Nice, thanks for the tip! 🎉