feat: l for details; details for vaults, scopes and files; getting started; the age of cached lists (#17)

- `l` goes to the details of what is selected; `enter` still drills in
- vaults, scopes and files show their details (vault settings from the listing, no extra requests)
- with nothing to show, the right pane says how to get started
- a list from the cache says how old it is while it reloads
- what is expiring, in the status pane and `lazysecrets expiring`
- when access is refused, what to check, for Azure and Databricks
- no group list in an account's details, and no Microsoft Graph call for it

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

internal/ui/app/status.go

@@ -38,6 +38,9 @@ func (m Model) statusLine() string {
 			failing++
 		}
 	}
+	if n := len(m.expiringItems()); n > 0 {
+		parts = append(parts, m.st.Warning.Render(fmt.Sprintf("⚠ %d expiring", n)))
+	}
 	if accounts > 0 {
 		s := plural(accounts, "account")
 		if failing > 0 {
@@ -88,6 +91,8 @@ func (m Model) statusFields() []panes.Field {
 		add(f)
 	}
 
+	out = append(out, m.expiringFields()...)
+
 	for i, path := range m.configFiles {
 		label := ""
 		if i == 0 {