Raise the visual briefing assistant to beta

app/MindWork AI Studio/Assistants/VisualBriefing/VisualBriefingAssistant.razor

@@ -10,7 +10,7 @@
            way the log viewer does. A plain div is enough here: unlike AssistantBase, this assistant
            deliberately has no area-wide drop zone, because its two zones have to be aimed at. *@
         <div class="inner-scrolling-context">
-            <PreviewPrototype ApplyInnerScrollingFix="true"/>
+            <PreviewBeta ApplyInnerScrollingFix="true"/>
             <MudStack Row="true" AlignItems="AlignItems.Center" Class="mb-3 mr-3" StretchItems="StretchItems.Start">
                 <MudText Typo="Typo.h3">@T("Visual Briefings")</MudText>
                 <MudSpacer/>