Add edit mode toggle and entry activation

internal/tui/update.go

@@ -18,6 +18,20 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 			} else {
 				m.focus = listPane
 			}
+		case "e":
+			if m.mode == ViewMode {
+				m.mode = EditMode
+			} else {
+				m.mode = ViewMode
+			}
+		case "a":
+			if m.mode == EditMode {
+				if entry := m.SelectedEntry(); entry != nil {
+					entry.Active = !entry.Active
+					m.list.SetItem(m.list.Index(), entryItem{entry})
+					m.refreshDetail()
+				}
+			}
 		case "up", "k":
 			if m.focus == detailPane {
 				m.detail.LineUp(1)