Web app: Markdown formatting for `code`

### What

Then using backtics to display code in a regular line of text, the rendered markdown gets displayed with a grey highlight, along with a monospace font.

When adding code inside a bulleted list, though, the rendered markdown only uses the monospace font, but without any highlighting.



### Why

Adding highlighting to `code` within bulleted lists will improve readability and provide a more consistent experience.

Requested [via Twitter](https://twitter.com/avernet/status/1511558123252699142)

Start by locating the web app's Markdown renderer and compare how inline code is rendered in a regular line versus a bulleted list. Done means inline code in both contexts has the same grey highlighting and monospace font; verify the behavior in the rendered web app.

Written by the indexing model from the issue text.