[Suggestion] Borders around elements for improved contrast

[ulrich-barnstedt]

Currently, elements like popups or the dock have no border, transitioning directly to the background.
While this works fine for light backgrounds:

It can be hard to discern where the box ends/starts on dark backgrounds:

I personally find this case is still somewhat ok, but for example on a background with fully black elements (here all black to demonstrate), it becomes impossible to tell apart:

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I think a possible solution to this might be adding a border around the elements, like the dock had previously:

Ubuntu 25.10 / Gnome 49:

Ubuntu 26.04 / Gnome 50:

While it always bothered me a bit that it wasnt exactly visually consistent with the rest, it did help with the contrast a lot and made the dock discernible with all backgrounds.
Therefore I think this might be a good idea to implement / at least provide an option for.

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Another issue I saw which also talks about it being hard to see against the background: #958

Also, since its already visible above: the boxes around notifications are currently very hard too see when using the latest version from git with popup blur

[MeguMario]

@ulrich-barnstedt would this be ok for you?

One downside of this is that on high brightness contrast between the blur elements and the background is not that good ngl

Edit: Also tweak the dock as well

[ulrich-barnstedt]

That already looks very nice, thanks for the quick fix! Especially having the notifications the same color as the rest of the elements in the panel looks perfect.

While already on the subject of borders, something else that I also noticed (I can also split this into a new issue if its completely unrelated in the code):

When expanding any element in the quick settings panel, theres no border or different background to distinguish it from the other elements:

On a light background it is visibly darker, but that also looks a bit out of place:

Notably, GSConnect seems to be an exception to this, it actually has a different background:

[MeguMario]

@ulrich-barnstedt Also covered by the PR above

if you have something like quick settings tweak it will look like this as well

[ulrich-barnstedt]

Ok perfect, thanks!