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/panes/fields.go

@@ -20,12 +20,15 @@ type Fields struct {
 
 // Field is a row: a value under a label. Info rows (loading, errors)
 // can't be copied; Err ones are errors. A row can also be opened: URL in
-// the browser (o), Path in the editor (e), or Provider signed in to (L).
+// the browser (o), Path in the editor (e), Provider signed in to (L), or
+// Link gone to (enter).
 type Field struct {
 	Label, Value string
 	Info, Err    bool
 
 	URL, Path, Provider string
+	// Link is a lazysecrets link enter goes to, in the source of row Row.
+	Link, Row string
 }
 
 func NewFields() Fields {