fix(toolbox): move Done 'Restart now' to footer-right (was clipped in content)

The in-content Restart button overflowed its fixed width. Move it into the wizard
footer's right slot (where Next/Apply sits) as a btn-primary; Routes owns the restart
shutdown now, DoneStep just shows the recovery key.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

windows/welcome/src/SilverOS.Welcome.UI/Components/Routes.razor

@@ -6,6 +6,7 @@
 @inject IAppCatalog AppCatalog
 @inject IPreconfigStore PreconfigStore
 @inject WizardState State
+@inject SilverOS.Welcome.Core.Apply.IProcessRunner ProcessRunner
 
 @if (_toolboxHome)
 {
@@ -83,6 +84,10 @@ else
                 @(_currentStep == _stepTitles.Length - 2 ? "Apply" : "Next")
             </button>
         }
+        else if (_currentStep == _stepTitles.Length - 1)
+        {
+            <button class="btn-primary" @onclick="RestartNow">Restart now</button>
+        }
     </div>
 </div>
 }
@@ -108,6 +113,11 @@ else
     private string? _error;
     private IReadOnlyList<FlavourManifest> _flavours = Array.Empty<FlavourManifest>();
 
+    private async Task RestartNow()
+    {
+        await ProcessRunner.RunAsync("cmd.exe", "/c shutdown /r /t 5", default);
+    }
+
     private bool CanGoNext => _currentStep switch
     {
         1 => State.Flavour is not null,

windows/welcome/src/SilverOS.Welcome.UI/Components/Steps/DoneStep.razor

@@ -1,5 +1,4 @@
 @using QRCoder
-@inject SilverOS.Welcome.Core.Apply.IProcessRunner ProcessRunner
 
 <div class="step done-step">
     <h1>All Done!</h1>
@@ -27,8 +26,6 @@
             </small></p>
         </div>
     }
-
-    <button class="btn-primary btn-restart" @onclick="RestartNow">Restart Now</button>
 </div>
 
 @code {
@@ -56,9 +53,4 @@
             catch { /* QR is best-effort; the key text still shows */ }
         }
     }
-
-    private async Task RestartNow()
-    {
-        await ProcessRunner.RunAsync("cmd.exe", "/c shutdown /r /t 5", CancellationToken.None);
-    }
 }