Git Panel Grouping and Bug Fixes

The git panel changes tab now groups files into "Uncommitted" and "Committed" sections:

Improvements:

• You can now link GitHub issues without needing Linear authentication
• Creating a workspace from a PR now shows the correct diff (previously it could show extra unrelated files)

Fixes:

• Fixed "Open in" detection for JetBrains IDEs installed through Toolbox
• Fixed extra blank space appearing at the bottom of the chat
• Fixed authentication failure message