enhance: add permalinks to pull request reviews (#38849) (#39036)

Backport #38849 by @silverwind

1. Make review threads linkable via `#pullrequestreview-<reviewID>`
2. Improve CSS so username and timestamp go colored on hover.
3. CSS cleanup, remove dead rules, nonexistant class name, make
`.suppressed` actually do what it says in the doc above.

<img width="351" height="84" alt="image"
src="https://github.com/user-attachments/assets/6ddf15d4-3d6e-4846-ab82-0ad0b19b372f"
/>

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

templates/repo/issue/sidebar/stopwatch_timetracker.tmpl

@@ -72,7 +72,7 @@
 			{{range $user, $trackedtime := .WorkingUsers}}
 				<div class="item tw-gap-3">
 					{{template "shared/user/avatarlink" dict "user" $user}}
-					<div>
+					<div class="muted-links">
 						{{template "shared/user/authorlink" $user}}
 						<div class="text">{{$trackedtime|Sec2Hour}}</div>
 					</div>