feat(queue): warn when the base branch has uncommitted changes

Queuing (update_task_status, batch_update_task_status) and run_task_now
now surface a non-blocking baseDirty warning (separate modified/untracked
counts) when the list's working dir has uncommitted changes at enqueue
time, since a new worktree forks from the commit tip and silently misses
them. BaseDirtyChecker caches per working dir for a few seconds so a
batch queue over many tasks in one list only shells out to git once. The
UI surfaces the same warning via the footer error strip on queue actions.

tests/ClaudeDo.Worker.Tests/Infrastructure/TaskStateServiceBuilder.cs

@@ -1,4 +1,5 @@
 using ClaudeDo.Data;
+using ClaudeDo.Worker.Git;
 using ClaudeDo.Worker.Hub;
 using ClaudeDo.Worker.Planning;
 using ClaudeDo.Worker.Queue;
@@ -21,7 +22,9 @@ public static class TaskStateServiceBuilder
         RunCancellationRegistry RunCancels);
 
     public static Built Build(
-        IDbContextFactory<ClaudeDoDbContext> dbFactory, Func<IActiveMergeState>? mergeState = null)
+        IDbContextFactory<ClaudeDoDbContext> dbFactory,
+        Func<IActiveMergeState>? mergeState = null,
+        IBaseDirtyChecker? baseDirtyChecker = null)
     {
         var hub = new CapturingHubContext();
         var broadcaster = new HubBroadcaster(hub);
@@ -37,6 +40,7 @@ public static class TaskStateServiceBuilder
             chain,
             runCancels,
             mergeState ?? (() => NoActiveMergeState.Instance),
+            baseDirtyChecker ?? new BaseDirtyChecker(new ClaudeDo.Data.Git.GitService(), NullLogger<BaseDirtyChecker>.Instance),
             NullLogger<TaskStateService>.Instance);
 
         return new Built(state, chain, hub, () => waker.Count, waker, runCancels);