fix(go-live): the Start Stream dialog re-reads Stream Info at open

Creator went live on the Debug build while the Release build was recording and got an empty
title/description, with the Stream Info tab filled in on screen. Both processes write to the same
profile: `BroadcastForm` is loaded ONCE at startup and each keystroke persists straight to the store,
so the instance that opened the dialog was holding the form as it was when it launched — before the
other instance saved those fields. The dialog copied from that stale copy.

`CreateGoLiveDialog` (new, extracted so it can be tested without showing a window) calls
`BroadcastForm.Load()` before composing the dialog. That is what the form's own doc comment always
claimed ("startup / Go Live refresh") but the refresh was never wired. It cannot lose an edit: every
keystroke is already persisted.

The dialog also logs `Go Live dialog: title='…' description=N chars`, so the next report of "the
dialog was blank" says immediately whether the values reached the dialog or never left the store.

Test: `BroadcastPullOutTests` writes metadata through a second `LayoutStore` handle (the other
instance) after the VM has loaded and asserts the dialog carries it. 572 green, 0 warnings.

ViewModels/MainViewModel.Streaming.Operations.cs

@@ -96,13 +96,25 @@ public partial class MainViewModel : ViewModelBase
         }
     }
 
-    private void BeginGoLive(bool alsoRecord)
+    /// <summary>Builds the Start Stream dialog's model from the Stream Info tab. Re-reads the store
+    /// first: the form is loaded once at startup, and a second LlamaCasty on the same profile (the dev
+    /// instance, or Release recording while Debug goes live) writes its edits straight to the store, so
+    /// this process's copy can be empty while the tab the creator filled in is not (2026-11-06).</summary>
+    internal GoLiveViewModel CreateGoLiveDialog()
     {
+        BroadcastForm.Load();
         var dialog = new GoLiveViewModel(() => SignInAsync(), _youtubeAuth.CurrentChannel)
         {
             StreamTitle = BroadcastForm.Title,
             StreamDescription = BroadcastForm.Description,
         };
+        AppLog.Write($"Go Live dialog: title='{dialog.StreamTitle}' description={dialog.StreamDescription.Length} chars");
+        return dialog;
+    }
+
+    private void BeginGoLive(bool alsoRecord)
+    {
+        var dialog = CreateGoLiveDialog();
         var window = new ytLive.GoLiveWindow(dialog) { Owner = System.Windows.Application.Current.MainWindow };
         if (window.ShowDialog() != true) return;