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>

docs/config.md

@@ -114,8 +114,9 @@ What lazysecrets has loaded is kept in
 you: the Sources lists, vaults and scopes, and secrets' names and metadata
 (tags, dates, references), never values. On the next start they show at
 once, and anything older than two minutes reloads in the background when
-you go to it, or when Go to searches it. Revealing and copying always
-fetch the value live.
+you go to it, or when Go to searches it. While it does, the pane's
+bottom border says how old what it shows is (`cached 3h ago`). Revealing
+and copying always fetch the value live.
 
 Lists not loaded for 30 days are dropped, and so is everything from an
 account you're no longer signed in to. Repos aren't cached: their files