feat(ui): add worker connection help modal

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/ClaudeDo.Ui/ViewModels/Modals/WorkerConnectionModalViewModel.cs

@@ -0,0 +1,45 @@
+using System;
+using System.Diagnostics;
+using ClaudeDo.Ui.Services;
+using CommunityToolkit.Mvvm.Input;
+
+namespace ClaudeDo.Ui.ViewModels.Modals;
+
+public sealed partial class WorkerConnectionModalViewModel : ViewModelBase
+{
+    private readonly WorkerLocator _workerLocator;
+    private readonly InstallerLocator _installerLocator;
+
+    public WorkerConnectionModalViewModel(WorkerLocator workerLocator, InstallerLocator installerLocator)
+    {
+        _workerLocator = workerLocator;
+        _installerLocator = installerLocator;
+    }
+
+    public Action? CloseAction { get; set; }
+
+    [RelayCommand] private void Close() => CloseAction?.Invoke();
+
+    [RelayCommand]
+    private void StartWorker()
+    {
+        var exe = _workerLocator.Find();
+        if (exe is null) return;
+        try { Process.Start(new ProcessStartInfo(exe) { UseShellExecute = true }); }
+        catch { /* nothing useful to show */ }
+        CloseAction?.Invoke();
+    }
+
+    [RelayCommand]
+    private void RerunInstaller()
+    {
+        var path = _installerLocator.Find();
+        if (path is null) return;
+        try
+        {
+            Process.Start(new ProcessStartInfo(path) { UseShellExecute = true });
+            Environment.Exit(0);
+        }
+        catch { /* nothing useful to show */ }
+    }
+}