Improve control char rendering and escape button styling (#37094)

Follow-up to #37078.

- Use Unicode Control Pictures](U+2400-U+2421) to render C0 control characters
- Make it work in diff view too
- Replace escape warning emoji with SVG
- Align escape warning button with code lines

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

templates/repo/view_file.tmpl

@@ -109,9 +109,7 @@
 						{{$line := Eval $idx "+" 1}}
 						<tr>
 							<td class="lines-num"><span id="L{{$line}}" data-line-number="{{$line}}"></span></td>
-							{{if $.EscapeStatus.Escaped}}
-								<td class="lines-escape">{{if (index $.LineEscapeStatus $idx).Escaped}}<button class="toggle-escape-button btn interact-bg" title="{{if (index $.LineEscapeStatus $idx).HasInvisible}}{{ctx.Locale.Tr "repo.invisible_runes_line"}} {{end}}{{if (index $.LineEscapeStatus $idx).HasAmbiguous}}{{ctx.Locale.Tr "repo.ambiguous_runes_line"}}{{end}}"></button>{{end}}</td>
-							{{end}}
+							{{ctx.RenderUtils.RenderUnicodeEscapeToggleTd $.EscapeStatus (index $.LineEscapeStatus $idx)}}
 							<td rel="L{{$line}}" class="lines-code chroma"><code class="code-inner">{{$code}}</code></td>
 						</tr>
 					{{end}}