fix: the details pane follows its secret's list when it reloads

A cached list is shown at once and reloaded in the background; the
selected secret's details stayed as first shown, old web page
included, until another secret was selected. When the reloaded list
has it changed, the details pane takes the new listing (a value shown
stays shown) and describes it afresh: its cached details came from
the old one.

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

internal/ui/app/app.go

@@ -679,12 +679,14 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 			if msg.bound != nil {
 				msg.key = m.rebind(*msg.bound)
 			}
+			before := m.cache.objects[msg.key].value
 			m.cache.objects[msg.key] = entry[[]provider.Object]{msg.items, m.now()}
 			m.cacheDirty = true
 			if m.versionsOf != nil {
 				m.setVersions(msg.items)
 			} else {
 				m.secrets.SetItems(m.starredFirst(msg.items))
+				cmds = append(cmds, m.refreshShown(before))
 			}
 		}