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.

src/ClaudeDo.Worker/State/TaskStateService.cs

@@ -1,6 +1,7 @@
 using ClaudeDo.Data;
 using ClaudeDo.Data.Models;
 using ClaudeDo.Data.Repositories;
+using ClaudeDo.Worker.Git;
 using ClaudeDo.Worker.Hub;
 using ClaudeDo.Worker.Planning;
 using ClaudeDo.Worker.Queue;
@@ -17,6 +18,7 @@ public sealed class TaskStateService : ITaskStateService
     private readonly PlanningChainCoordinator _chain;
     private readonly RunCancellationRegistry _runCancels;
     private readonly Func<IActiveMergeState> _mergeState;
+    private readonly IBaseDirtyChecker _baseDirtyChecker;
     private readonly ILogger<TaskStateService> _logger;
 
     public TaskStateService(
@@ -26,6 +28,7 @@ public sealed class TaskStateService : ITaskStateService
         PlanningChainCoordinator chain,
         RunCancellationRegistry runCancels,
         Func<IActiveMergeState> mergeState,
+        IBaseDirtyChecker baseDirtyChecker,
         ILogger<TaskStateService> logger)
     {
         _dbFactory = dbFactory;
@@ -34,6 +37,7 @@ public sealed class TaskStateService : ITaskStateService
         _chain = chain;
         _runCancels = runCancels;
         _mergeState = mergeState;
+        _baseDirtyChecker = baseDirtyChecker;
         _logger = logger;
     }
 
@@ -56,7 +60,17 @@ public sealed class TaskStateService : ITaskStateService
 
         _waker.Wake();
         await _broadcaster.TaskUpdated(taskId);
-        return new TransitionResult(true, null);
+
+        // Heads-up only: a worktree forks from the commit tip (WorktreeManager.ResolveBaseCommitAsync),
+        // not the working tree, so uncommitted changes sitting in the list's repo right now are
+        // invisible to this (and every other) queued task. Never blocks the transition above.
+        var workingDir = await ctx.Tasks.AsNoTracking()
+            .Where(t => t.Id == taskId)
+            .Select(t => t.List.WorkingDir)
+            .FirstOrDefaultAsync(ct);
+        var baseDirty = await _baseDirtyChecker.CheckAsync(workingDir, ct);
+
+        return new TransitionResult(true, null, baseDirty);
     }
 
     public async Task<TransitionResult> StartRunningAsync(string taskId, DateTime startedAt, CancellationToken ct)