Draft: Add dark mode syntax highlighting option
What does this MR do and why?
Add syntax highlight options for light and dark mode Refactor styles to use Tailwind utility classes Remove old styles
References
Screenshots or screen recordings
| Before | After |
|---|---|
How to set up and validate locally
- View profile preferences https://gdk.test:3443/-/profile/preferences#syntax-highlighting-theme
- Toggle syntax highlight theme for light and dark mode
- Toggle light and dark mode in "Appearance" settings above (or use "Auto")
- Ensure syntax highlight themes apply as expected
MR acceptance checklist
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Related to #470413 (closed)