Backport #27632 by @wxiaoguang
1. fix#27631 , and add samples to devtest page
2. fix incorrect color for "ui dropdown button" when hover
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
I think it's better if the primary actions have primary color instead of
green which fits better into the overall single-color UI design. This PR
currently replaces every green button with primary:
<img width="141" alt="Screenshot 2023-09-16 at 14 07 59"
src="843c1e50-4fb2-4ec6-84ba-0efb9472dcbe">
<img width="161" alt="Screenshot 2023-09-16 at 14 07 51"
src="9442195a-a3b2-4a42-b262-8377d6f5c0d1">
Modal actions now use uncolored/primary instead of previous green/red
colors. I also removed the box-shadow on all basic buttons:
<img width="259" alt="Screenshot 2023-09-16 at 14 16 39"
src="5beea529-127a-44b0-8d4c-afa7b034a490">
<img width="261" alt="Screenshot 2023-09-16 at 14 17 42"
src="4757f7b2-4d46-49bc-a797-38bb28437b88">
The change currently includes the "Merge PR" button, for which we might
want to make an exception to match the icon color there:
<img width="442" alt="Screenshot 2023-09-16 at 14 33 53"
src="993ac1a5-c94d-4895-b76c-0d872181a70b">
Replace #26850
Major changes:
1. Remove all `has` selectors, it is still not supported by firefox.
Actually there could be some more general and clearer approaches
2. Remove `two-toggle-buttons`, the `.ui.buttons` just works well
3. Rewrite the `.ui.buttons` border styles, see the screenshots
4. Remove the "fine-tuning" paddings from the the flex children, they
could layout themselves well.




Fix#26617
1. Separate the "flex-list" examples into a dedicated template, and add some more examples
2. Use `flex-basis` instead of `flex-shrink` for `flex-item-trailing`, to avoid wrapping the texts too aggressively
3. Some `flex-wrap: wrap;` are removed
This PR introduces a new UI element type for Gitea called `flex-item`.
It consists of a horizontal card with a leading, main and trailing part:

The idea behind it is that in Gitea UI, we have many cases where we use
this kind of layout, but it is achieved in many different ways:
- grid layout
- `.ui.list` with additional hacky flexbox
- `.ui.key.list` - looks to me like a style set originally created for
ssh/gpg key list, was used in many other places
- `.issue.list` - created for issue cards, used in many other places
- ...
This new style is based on `.issue.list`, specifically the refactoring
of it done in #25750.
In this PR, the new element is introduced and lots of templates are
being refactored to use that style. This allows to remove a lot of
page-specific css, makes many of the elements responsive or simply
provides a cleaner/better-looking way to present information.
A devtest section with the new style is also available.
<details>
<summary>Screenshots (left: before, right: after)</summary>



















</details>
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Co-authored-by: Giteabot <teabot@gitea.io>
- Various corrections to button styles, especially secondary
- Remove focus highlight, it's annoying when it stays on button after
press
- Clearly define ghost and link buttons with demos in devtest
- Remove black, grey and tertiary buttons, they should not be used
- Make `arc-green` slightly darker
<img width="1226" alt="image"
src="8d89786a-01ab-40f8-ae5a-e17f40e35084">
<img width="1249" alt="image"
src="83651e6d-3c27-46ff-b8bd-ff344d70e949">
---------
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: Giteabot <teabot@gitea.io>