Scroll to bottom after adding follow‑up widget

When a follow‑up widget was appended to the message layout the view
did not automatically scroll to the new content.
The change now calls `scrollToBottom()` from `createFollowUpWidget` and
defers the actual scroll action with `QTimer::singleShot(100)`.
This gives the layout time to finish rendering before the scrollbar is
updated, ensuring the latest message is visible immediately and
eliminating jitter when the editor is first opened or after a rapid
series of messages.

Also updated the implementation of `scrollToBottom()` to use the
timer instead of setting the scrollbar value directly.

Author: cristianadam

llamachateditor.cpp

@@ -273,6 +273,8 @@ void ChatEditor::createFollowUpWidget(const QString &convId,
     lay->addStretch();
     // Append below the regular messages
     m_messageLayout->addWidget(m_followUpWidget);
+
+    scrollToBottom();
 }
 
 void ChatEditor::refreshMessages(const QVector<Message> &messages, qint64 leafNodeId)
@@ -512,8 +514,11 @@ void ChatEditor::updateSpeedLabel(const Message &msg)
 
 void ChatEditor::scrollToBottom()
 {
-    QScrollBar *sb = m_scrollArea->verticalScrollBar();
-    sb->setValue(sb->maximum());
+    // Scroll to bottom after the layout has finished
+    QTimer::singleShot(100, this, [this] {
+        QScrollBar *sb = m_scrollArea->verticalScrollBar();
+        sb->setValue(sb->maximum());
+    });
 }
 
 class ChatEditorFactory final : public IEditorFactory