Render code tags in commit messages (#30146)

Extend #21432 to commit messages.
Color is changed because the markup code block bg does not offer enough
contrast on varying backgrounds.

<img width="568" alt="Screenshot 2024-03-27 at 19 52 55"
src="https://github.com/go-gitea/gitea/assets/115237/ddc9307e-f32f-4e97-8b88-91f88ced2a36">
<img width="573" alt="Screenshot 2024-03-27 at 19 53 33"
src="https://github.com/go-gitea/gitea/assets/115237/14b30fd2-bf28-46b8-9e82-eb60a28f6bf2">
<img width="422" alt="Screenshot 2024-03-27 at 19 53 01"
src="https://github.com/go-gitea/gitea/assets/115237/a12136b5-c02b-460c-9830-f830542987ae">
<img width="397" alt="Screenshot 2024-03-27 at 19 53 27"
src="https://github.com/go-gitea/gitea/assets/115237/c9f05d81-c73e-468e-98e9-e5929bc0da3e">
<img width="333" alt="Screenshot 2024-03-27 at 19 53 07"
src="https://github.com/go-gitea/gitea/assets/115237/06b5a9f9-f95d-46b6-8c57-df0b02555652">
<img width="279" alt="Screenshot 2024-03-27 at 19 53 21"
src="https://github.com/go-gitea/gitea/assets/115237/b06a0afc-ddd8-48ae-b557-a6dc47802e68">

modules/templates/util_render.go

@@ -41,7 +41,7 @@ func RenderCommitMessage(ctx context.Context, msg string, metas map[string]strin
 	if len(msgLines) == 0 {
 		return template.HTML("")
 	}
-	return template.HTML(msgLines[0])
+	return RenderCodeBlock(template.HTML(msgLines[0]))
 }
 
 // RenderCommitMessageLinkSubject renders commit message as a XSS-safe link to
@@ -68,7 +68,7 @@ func RenderCommitMessageLinkSubject(ctx context.Context, msg, urlDefault string,
 		log.Error("RenderCommitMessageSubject: %v", err)
 		return template.HTML("")
 	}
-	return template.HTML(renderedMessage)
+	return RenderCodeBlock(template.HTML(renderedMessage))
 }
 
 // RenderCommitBody extracts the body of a commit message without its title.

web_src/css/base.css

@@ -300,8 +300,8 @@ a.label,
 
 .inline-code-block {
   padding: 2px 4px;
-  border-radius: var(--border-radius-medium);
-  background-color: var(--color-markup-code-block);
+  border-radius: .24em;
+  background-color: var(--color-label-bg);
 }
 
 /* fix Fomantic's line-height cutting off "g" on Windows Chrome with Segoe UI */