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

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

options/locale/locale_en-US.json

@@ -1216,7 +1216,7 @@
   "repo.ambiguous_runes_description": "This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.",
   "repo.invisible_runes_line": "This line has invisible unicode characters",
   "repo.ambiguous_runes_line": "This line has ambiguous unicode characters",
-  "repo.ambiguous_character": "%[1]c [U+%04[1]X] can be confused with %[2]c [U+%04[2]X]",
+  "repo.ambiguous_character": "%[1]s can be confused with %[2]s",
   "repo.escape_control_characters": "Escape",
   "repo.unescape_control_characters": "Unescape",
   "repo.file_copy_permalink": "Copy Permalink",