Copilot billing in settings; discussion markdown bar fixed

What's new

• View billing info in Copilot settings.
• Copy Copilot logs with the new "Copy" button.

Bug fixes

• Fixed an issue where fork information for a repository cut off at larger accessibility sizes.
• Fixed an incorrect accessibility label in notification watch settings.
• Fixed an issue where the markdown bar didn’t appear when creating a new discussion.
• Fixed an issue where trending repositories didn’t load reliably.
• Fixed an issue where dismissed Copilot chat usage banners reappeared after sending a message.