Sidebar Improvements

- [ ] Possibly change styling of parenthesised sections in titles?
- Maybe make titles fit on a single line
- This is a content thing, not a theme thing

No file, test, or entry point is named in the issue. Start by locating the theme templates or styles responsible for the sidebar and title rendering, then separate the styling request from the noted content change. Done should be defined as an agreed treatment for parenthesised sections and a clear decision about single-line titles.

Written by the indexing model from the issue text.