feat: a list from the cache says how old it is while it reloads

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

internal/ui/panes/list.go

@@ -34,6 +34,9 @@ type List[T any] struct {
 	Empty   string // shown when loaded with no items
 	Loading bool
 	Err     error
+	// Age says how old the items are ("2h ago") while they reload, by
+	// the counter.
+	Age string
 
 	item    Item[T]
 	items   []T
@@ -88,6 +91,7 @@ func (l *List[T]) SetError(err error) {
 func (l *List[T]) Refresh() {
 	l.Loading = true
 	l.Err = nil
+	l.Age = ""
 }
 
 func (l *List[T]) SetLoading() {
@@ -369,6 +373,9 @@ func (l List[T]) View(st styles.Styles, focused bool, spin string) string {
 	if len(l.visible) > 0 {
 		counter = fmt.Sprintf("%d of %d", l.cursor+1, len(l.visible))
 	}
+	if l.Loading && l.Age != "" && len(l.items) > 0 {
+		counter = "cached " + l.Age + " · " + counter
+	}
 	return BoxCounted(st, title, "", counter, body, l.w, l.h, focused)
 }