feat(ui): reveal a task by id from anywhere

tests/ClaudeDo.Ui.Tests/ViewModels/MissionControlViewModelTests.cs

@@ -114,4 +114,20 @@ public class MissionControlViewModelTests : IDisposable
         public override IReadOnlyList<ActiveTask> GetActiveTasks()
             => new[] { new ActiveTask("slot-1", "seed1", DateTime.UtcNow) };
     }
+
+    [Fact]
+    public void OpenInApp_PropagatesToMonitors_AndCommandInvokesHook()
+    {
+        var worker = new FakeWorker();
+        using var vm = BuildVm(worker);
+
+        string? revealed = null;
+        vm.OpenInApp = id => revealed = id;
+
+        worker.RaiseTaskStarted("slot-1", "t1", DateTime.UtcNow);
+
+        vm.Monitors[0].OpenInAppCommand.Execute(null);
+
+        Assert.Equal("t1", revealed);
+    }
 }

tests/ClaudeDo.Ui.Tests/ViewModels/TasksIslandSelectByIdTests.cs

@@ -0,0 +1,91 @@
+using ClaudeDo.Data;
+using ClaudeDo.Data.Models;
+using ClaudeDo.Ui.ViewModels.Islands;
+using Microsoft.EntityFrameworkCore;
+using TaskStatus = ClaudeDo.Data.Models.TaskStatus;
+
+namespace ClaudeDo.Ui.Tests.ViewModels;
+
+public class TasksIslandSelectByIdTests : IDisposable
+{
+    private readonly string _dbPath;
+
+    public TasksIslandSelectByIdTests()
+    {
+        _dbPath = Path.Combine(Path.GetTempPath(), $"claudedo_ui_selectbyid_{Guid.NewGuid():N}.db");
+        using var ctx = NewContext();
+        ctx.Database.EnsureCreated();
+    }
+
+    public void Dispose()
+    {
+        try { File.Delete(_dbPath); } catch { }
+        try { File.Delete(_dbPath + "-wal"); } catch { }
+        try { File.Delete(_dbPath + "-shm"); } catch { }
+    }
+
+    private ClaudeDoDbContext NewContext()
+    {
+        var opts = new DbContextOptionsBuilder<ClaudeDoDbContext>()
+            .UseSqlite($"Data Source={_dbPath}")
+            .Options;
+        return new ClaudeDoDbContext(opts);
+    }
+
+    private sealed class TestDbFactory : IDbContextFactory<ClaudeDoDbContext>
+    {
+        private readonly Func<ClaudeDoDbContext> _create;
+        public TestDbFactory(Func<ClaudeDoDbContext> create) => _create = create;
+        public ClaudeDoDbContext CreateDbContext() => _create();
+    }
+
+    private async Task SeedAsync()
+    {
+        await using var db = NewContext();
+        db.Lists.Add(new ListEntity
+        {
+            Id = "L1",
+            Name = "Work",
+            CreatedAt = DateTime.UtcNow,
+        });
+        db.Tasks.Add(new TaskEntity
+        {
+            Id = "T1",
+            ListId = "L1",
+            Title = "My task",
+            Status = TaskStatus.Idle,
+            ParentTaskId = null,
+            CreatedAt = DateTime.UtcNow,
+            SortOrder = 0,
+        });
+        await db.SaveChangesAsync();
+    }
+
+    [Fact]
+    public async Task SelectByIdAsync_ReturnsTrue_AndSetsSelectedTask()
+    {
+        await SeedAsync();
+        var factory = new TestDbFactory(NewContext);
+        var vm = new TasksIslandViewModel(factory, worker: null);
+
+        vm.LoadForList(new ListNavItemViewModel { Id = "user:L1", Name = "Work", Kind = ListKind.User });
+        var found = await vm.SelectByIdAsync("T1");
+
+        Assert.True(found);
+        Assert.Equal("T1", vm.SelectedTask?.Id);
+    }
+
+    [Fact]
+    public async Task SelectByIdAsync_MissingId_ReturnsFalse_AndLeavesSelectedTaskNull()
+    {
+        await SeedAsync();
+        var factory = new TestDbFactory(NewContext);
+        var vm = new TasksIslandViewModel(factory, worker: null);
+
+        vm.LoadForList(new ListNavItemViewModel { Id = "user:L1", Name = "Work", Kind = ListKind.User });
+        var found = await vm.SelectByIdAsync("missing");
+
+        Assert.False(found);
+        Assert.Null(vm.SelectedTask);
+    }
+}