ui: Minor UI fixes

[manojVivek]

Fixes:

• Fixed yellow bg highlight in source view to be applied to the whole line
• Fixed the Hover bubble flickering
• Fixed the flamegraph error that was blocking the entire visualization panel

[alwaysmeticulous]

🤖 Meticulous spotted visual differences in 89 of 265 screens tested: view and approve differences detected.

_{Last updated for commit 227988d. This comment will update as new commits are pushed.}