Wire TasksIslandViewModel to TaskUpdated/WorktreeUpdated/TaskMessage worker
events so rows refresh without a full reload; add ForegroundHelper to permit
wt.exe to take foreground on planning launch; misc UI polish on lists, task
rows and settings modal.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Add PlanningSessionFiles, PlanningSessionStartContext/ResumeContext DTOs,
PlanningSessionManager.StartAsync (file scaffolding + status transition),
and integration tests. Also fix migration discovery by adding [DbContext]
attribute to all migration classes and switch DbFixture to EnsureCreated.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>