Render initial chat prompt and submitted messages

ui.go

@@ -78,6 +78,10 @@ func (b *Barnard) UpdateInputStatus(status string) {
 	}
 	b.Ui.Post(func() {
 		b.UiInputStatus.Text = status
+		// The initial connection status arrives after Run's first layout. Relayout
+		// so the prompt has cells to draw before focus is changed.
+		width, height := termbox.Size()
+		b.OnUiResize(b.Ui, width, height)
 		b.RebuildUserChannelTreePreservingSelection()
 		b.Ui.Refresh()
 	})
@@ -516,8 +520,9 @@ func (b *Barnard) OnUiInitialize(ui *uiterm.Ui) {
 	ui.Add(uiViewInput, &b.UiInput)
 
 	b.UiInputStatus = uiterm.Label{
-		Fg: uiterm.ColorBlack,
-		Bg: uiterm.ColorWhite,
+		Text: "[root]",
+		Fg:   uiterm.ColorBlack,
+		Bg:   uiterm.ColorWhite,
 	}
 	ui.Add(uiViewInputStatus, &b.UiInputStatus)