Backport #27356 by @silverwind
Various improvements related to feeds:
- Fix markdown rendering
- Increase font size from 13px to default 14px via `flex-item`
- Add style to hashes
- Move the timestamp to title line. I realize it's not optimal for
translation, we may need to change all these translations
Before:
<img width="768" alt="Screenshot 2023-09-29 at 22 52 58"
src="edda8b84-23cf-4a43-90ad-a892798f4e6c">
After:
<img width="781" alt="Screenshot 2023-09-29 at 22 58 09"
src="7097474d-efcf-4f22-a2ab-834a4e25c4e8">
Co-authored-by: silverwind <me@silverwind.io>
Align everything with a new layout.
* Use "baseline" for some special elements, the "flex-item-icon" is for
the issue list only at the moment and I think it should be general
enough now (but not using "flex-item-leading" anymore in this case).
* Make the labels stretch themselves.
1. There is already `gt-ac`, so no need to introduce `flex-item-center`
2. The `flex-item-baseline` and `.flex-item-icon svg { margin-top: 1px
}` seem to be a tricky patch, they don't resolve the root problem, and
still cause misalignment in some cases.
* The root problem is: the "icon" needs to align with the sibling
"title"
* So, make the "icon" and the "title" both have the same height
3. `flex-text-inline` could only be used if the element is really
"inline", otherwise its `vertical-align` would make the box size change.
In most cases, `flex-text-block` is good enough.

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Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: Giteabot <teabot@gitea.io>
1. In many cases, the `flex-list` has previous and next `gt-hidden`
siblings, so relax the CSS selector to remove all ".segument .flex-list"
paddings.
2. Make the "Add key" button can toggle
3. Move help message into the related segment(panel). Otherwise users
would misread the message, eg: the SSH help seemed for GPG because they
are so near
4. Move modal element into the segment element, otherwise it affects the
layout
Some small dashboard tweaks:
- Remove margin-bottom from divider so first item does not appear to
have un-equal margins
- Restore previous icon color
- Add slight margin-right to icon
Before:
<img width="783" alt="Screenshot 2023-08-31 at 00 10 28"
src="b75f70d7-8704-4afb-866d-fea0484c52d4">
After:
<img width="783" alt="Screenshot 2023-08-31 at 00 10 08"
src="50ed0c47-6f7c-449e-a054-13091369d43f">
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Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Replace #26761
It's better to keep children elements simple, and let parent containers
layout the necessary padding/margin.
The old `not(:last-child)` and `.flex-item + .flex-item` are not easy to
maintain (for example, what if the developer would like to use a "tiny
height" item?)
The old approach also makes some UI look strange because the first item
doesn't have proper padding-top.
In this PR, we just simply use `.flex-item { padding: ... }`:
* Developers could manually set the item height they want easily
* It's easier to make it work with various containers -- with padding
(`ui segment`) and without padding (`div`)
And added more samples/examples.

Co-authored-by: Giteabot <teabot@gitea.io>
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>