Rewrote all Border.terminal TextBlock log-kind selectors from CSS
class form (.log-sys) to attribute form ([Tag=log-sys]), matching
the pattern used by the diff-line selectors. Classes are not set on
dynamically created TextBlocks; Tag binding works.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Adds WorktreeModalView/ViewModel showing git status --porcelain as a
recursive file tree with M/A/D/? status badges. Wires the Worktree
button in AgentStripView to OpenWorktreeCommand on DetailsIslandViewModel.
Adds GetStatusPorcelainAsync to GitService.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
