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>

README.md

@@ -23,7 +23,8 @@ A terminal UI for finding, reading and sharing secrets. Inspired by the fantasti
 - **Favourites**: star the secrets you use most and get back to them in one
   key.
 - **Expiry warnings**: secrets, keys and certificates that expire soon are
-  marked.
+  marked, listed together in the status pane, and `lazysecrets expiring`
+  checks every vault from a pipeline.
 - **Your way**: rebind any key, pick a theme, and add custom commands to run
   on a secret.
 - **Try it first**: `lazysecrets --demo` runs on built-in sample data.
@@ -60,12 +61,14 @@ lazysecrets         # start lazysecrets
 lazysecrets --demo  # test with demo data
 ```
 
-Pick a source on the left, then a vault, then a secret. The keys you'll
+Pick a source on the left, then a vault, then a secret. With nothing
+signed in yet, the right pane says how to get started. The keys you'll
 use most:
 
 | Key | Action |
 |---|---|
-| `j`/`k`, `h`/`l`, `enter`, `esc` | move, switch panes, drill in, back |
+| `j`/`k`, `enter`, `esc` | move, drill in, back |
+| `l` / `h` | the details of what's selected / back |
 | `/` | filter the list you're in |
 | `space` | reveal / hide the value |
 | `y` | copy the value (cleared from the clipboard after 30s) |