feat(ui): add settings modal and wire to worker hub

src/ClaudeDo.Ui/Services/WorkerClient.cs

@@ -226,6 +226,47 @@ public partial class WorkerClient : ObservableObject, IAsyncDisposable
         await _hub.DisposeAsync();
     }
 
+    public async Task<AppSettingsDto?> GetAppSettingsAsync()
+    {
+        try
+        {
+            return await _hub.InvokeAsync<AppSettingsDto>("GetAppSettings");
+        }
+        catch
+        {
+            return null;
+        }
+    }
+
+    public async Task UpdateAppSettingsAsync(AppSettingsDto dto)
+    {
+        await _hub.InvokeAsync("UpdateAppSettings", dto);
+    }
+
+    public async Task<WorktreeCleanupDto?> CleanupFinishedWorktreesAsync()
+    {
+        try
+        {
+            return await _hub.InvokeAsync<WorktreeCleanupDto>("CleanupFinishedWorktrees");
+        }
+        catch
+        {
+            return null;
+        }
+    }
+
+    public async Task<WorktreeResetDto?> ResetAllWorktreesAsync()
+    {
+        try
+        {
+            return await _hub.InvokeAsync<WorktreeResetDto>("ResetAllWorktrees");
+        }
+        catch
+        {
+            return null;
+        }
+    }
+
     // DTOs for deserializing hub responses
     private sealed class ActiveTaskDto
     {
@@ -234,3 +275,16 @@ public partial class WorkerClient : ObservableObject, IAsyncDisposable
         public DateTime StartedAt { get; set; }
     }
 }
+
+public sealed record AppSettingsDto(
+    string DefaultClaudeInstructions,
+    string DefaultModel,
+    int DefaultMaxTurns,
+    string DefaultPermissionMode,
+    string WorktreeStrategy,
+    string? CentralWorktreeRoot,
+    bool WorktreeAutoCleanupEnabled,
+    int WorktreeAutoCleanupDays);
+
+public sealed record WorktreeCleanupDto(int Removed);
+public sealed record WorktreeResetDto(int Removed, int TasksAffected, bool Blocked, int RunningTasks);