Fix tooltips and issue dependency styles (#13458)

- Convert all tooltips to JS-based ones, fixing overflow issues
- Restyle issue dependencies/dependants
- Move popup styles to base style
- CSS Helper tweaks
- Unify pseudo element selectors and lint for it

Fixes: https://github.com/go-gitea/gitea/issues/13400

templates/repo/view_file.tmpl

@@ -22,7 +22,7 @@
 						</div>
 					{{end}}
 					{{if .LFSLock}}
-						<div class="file-info-entry ui" data-tooltip="{{.LFSLockHint}}" data-inverted="">
+						<div class="file-info-entry ui poping up" data-content="{{.LFSLockHint}}">
 							{{svg "octicon-lock" 16 "mr-2"}}
 							<a href="{{AppSubUrl}}/{{.LFSLock.Owner.Name}}">{{.LFSLockOwner}}</a>
 						</div>