Copilot on Windows fixed; worktree repos no longer appear missing

Fixed

• Resolve error that prevented Copilot-based features from working correctly on Windows - #22509
• Keep commit message @-mention autocomplete from surfacing users without a profile name when typing queries like "null" - #22414. Thanks @sukanth!
• Resolve a crash where the truncated repository path text could enter an infinite re-render loop - #22458
• Fall back to the main worktree so a repository no longer appears as missing when its linked worktree folder was deleted outside Desktop - #22474
• Keep files visible in the Changes list after Desktop returns from being backgrounded - #22497
• Show an error dialog instead of silently doing nothing when Copilot fails to generate a commit message due to a git error - #22496
• Copilot sessions from generating commit messages or resolving conflicts do not show up in VS Code - #22443
• Repository list scrolling no longer gets stuck or jitters when scrolling over tall groups (e.g. large organizations) - #22438. Thanks @peteski22!

Improved

• Clarify the line-ending conversion warning to explain that Git will automatically convert the file's line endings on next checkout, with a link to learn more - #21446. Thanks @Whitebrim!