Drop the icon sample row; give tool panes a working PATH and a reason to stay open; answer the open questions

tui/board.go

@@ -170,6 +170,12 @@ func (m boardModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 			case "down", "j":
 				m.toolAt = min(len(tools)-1, m.toolAt+1)
 				return m, nil
+			case "g":
+				m.toolAt = 0
+				return m, nil
+			case "G":
+				m.toolAt = len(tools) - 1
+				return m, nil
 			case "enter":
 				t := tools[m.toolAt]
 				m.tools = false