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/app/app.go

@@ -456,6 +456,8 @@ func New(providers []provider.Provider, opts Options) Model {
 		m.loadCacheFile()
 		if len(m.sourceResults) > 0 {
 			m.rebuildSources()
+			m.sources.Loading = true // reloading what the file had
+			m.sources.Age = m.cachedAge(m.oldestSources())
 		}
 	}
 	if m.placeDir != "" && opts.Open == nil {
@@ -1154,6 +1156,7 @@ func (m *Model) showContainers(src provider.Source, key string) tea.Cmd {
 		return nil
 	}
 	m.containers.Refresh()
+	m.containers.Age = m.cachedAge(e.at)
 	return m.loadContainers(src, key)
 }
 
@@ -1170,6 +1173,7 @@ func (m *Model) showObjects(c provider.Container, key string) tea.Cmd {
 		return nil
 	}
 	m.secrets.Refresh()
+	m.secrets.Age = m.cachedAge(e.at)
 	return m.loadObjects(c, m.objType, key)
 }
 
@@ -1299,6 +1303,26 @@ func (m *Model) detailStale() bool {
 	return hasSecret || shown != m.containers.SelectedID()
 }
 
+// cachedAge is how old a list loaded at at is, if it's older than
+// cacheTTL: the panes say it while it reloads.
+func (m Model) cachedAge(at time.Time) string {
+	if d := m.now().Sub(at); d >= cacheTTL {
+		return ago(d)
+	}
+	return ""
+}
+
+// oldestSources is when the oldest of the cached Sources lists loaded.
+func (m Model) oldestSources() time.Time {
+	var oldest time.Time
+	for _, at := range m.sourcesAt {
+		if oldest.IsZero() || at.Before(oldest) {
+			oldest = at
+		}
+	}
+	return oldest
+}
+
 func (m *Model) handleSources(msg sourcesMsg) tea.Cmd {
 	if msg.gen != m.sourcesGen {
 		return nil