Crash loop on truncated paths fixed; deleted worktrees no longer hide repos

Fixed

• 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