UI Improvements: unified link color, removed link underline, made window wider

[lisadunlap]

Why are these changes needed?

• I go slightly insane looking at the slightly different link colors
• link underlines are very busy
• wider window - easier to see llm outputs (esp in side by side) Before:

After:

Related issue number (if applicable)

Checks

• [x] I've run format.sh to lint the changes in this PR.
• [x] I've included any doc changes needed.
• [x] I've made sure the relevant tests are passing (if applicable).