Various UI fixes (#25264) (#25431)

Backport #25264 by @silverwind

Numerous small UI fixes:

- Fix double border in collaborator list
- Fix system notice table background
- Mute links in repo and org lists
- Downsize projects edit buttons
- Improve milestones and project list rendering
- Condense milestone list entry to a single line of "metas"
- Mute ".." button in repo files list

<img width="899" alt="Screenshot 2023-06-14 at 21 19 23"
src="40d70006-5f76-49ad-b43c-4343ec3311e1">

<img width="905" alt="Screenshot 2023-06-14 at 21 18 29"
src="46ef39ea-ab26-452d-89b0-a55d0cfacfdb">

<img width="270" alt="Screenshot 2023-06-14 at 21 14 09"
src="aa16e833-a03b-4231-bc7c-159a6a6bee19">

<img width="409" alt="Screenshot 2023-06-14 at 21 12 13"
src="b5242d41-f87a-4837-b0cf-9cc4c1f43daf">

<img width="286" alt="Screenshot 2023-06-14 at 21 10 03"
src="d0c36e47-651b-4d34-ad95-3d59474a7c3e">

<img width="928" alt="Screenshot 2023-06-14 at 21 05 24"
src="fc3b713e-d252-40f5-b6ba-6e5a741ab500">

<img width="217" alt="Screenshot 2023-06-14 at 21 02 01"
src="c4c33376-18d6-4820-aff5-f508f6d351a0">
<img width="79" alt="Screenshot 2023-06-14 at 20 42 43"
src="034b5950-c0bf-473b-a2f7-0c27a0259f29">
<img width="607" alt="Screenshot 2023-06-14 at 21 00 42"
src="fba2d3fd-bd3e-4daf-8b2f-530a1c99c8bc">

Co-authored-by: silverwind <me@silverwind.io>

web_src/css/base.css

@@ -869,6 +869,13 @@ a.label,
   border-color: var(--color-secondary);
 }
 
+.ui.table > tfoot > tr > th,
+.ui.table > tfoot > tr > td {
+  border-color: var(--color-secondary);
+  background: var(--color-box-body);
+  color: var(--color-text);
+}
+
 img.ui.avatar,
 .ui.avatar img,
 .ui.avatar svg {

web_src/css/repo.css

@@ -1952,10 +1952,6 @@
   line-height: 2em;
 }
 
-.repository.settings.collaboration .collaborator.list > .item:not(:last-child) {
-  border-bottom: 1px solid var(--color-secondary);
-}
-
 .repository.settings.collaboration #repo-collab-form #search-user-box .results {
   left: 7px;
 }

web_src/css/shared/issuelist.css

@@ -135,10 +135,6 @@
   margin-right: -4px;
 }
 
-.issue.list > .item .desc .overdue {
-  color: var(--color-red);
-}
-
 .issue.list .branches {
   display: inline-flex;
   padding: 0 4px;

web_src/css/shared/milestone.css

@@ -44,10 +44,6 @@
   gap: 8px;
 }
 
-.milestone-toolbar .group .overdue {
-  color: var(--color-red);
-}
-
 .milestone-toolbar .group > a {
   font-size: 15px;
   color: var(--color-text-light-2);