feat: lazysecrets list prints everything lazysecrets can find, for fzf and editor pickers (#70)

`lazysecrets list` prints every source, vault and secret lazysecrets can find, one per line, for fzf, editor pickers and scripts: what Go to searches, without the TUI. What's cached prints at once; what's missing or older than `--max-age` loads in the background and streams in. It stops when the reader goes (a pick in fzf), saving what it loaded.

- Text: kind, mark (✗/⚠, ★, ◷ and the provider icon), name, status (why it couldn't be read, or expired / expires in 12d), note, account and link, tab-separated; kind first and account and link last, so new fields go between. Coloured from the theme; `--color never`, `--icons=false`, `--stars=false`, `--recent`, `--notes=false`, `--expiry=false`.
- `--format json`: an object per line, with starred, recent, lastUsed and uses, expires, enabled, note, reference and url too.
- `--kind` lists only some kinds, and doesn't load lists only other kinds need; `--cached` loads nothing.
- `lazysecrets open --action go|copy|show` skips the "what to do" menu and ends in the list, like Go to; `open` and `get` take `--account`, the account list printed, rather than asking which.
- The cache file moved to `internal/cachefile`: saves merge with the file under a lock, so list and the TUI don't undo each other.
- `ui.recentIcon` marks items used lately with ◷ in the TUI's lists too; Recent now means the last 90 days.
- --demo has stars, notes, recent use, and expired, expiring and disabled secrets.
- docs/integration.md documents get, list and an fzf picker; docs/links.md is docs/sharing.md.

Reviewed-on: #70
Co-authored-by: Karl-Einar Bergstrøm <karl-einarb@outlook.com>

internal/ui/app/cache.go

@@ -67,10 +67,23 @@ func (m *Model) refreshShown(before []provider.Object) tea.Cmd {
 		return nil
 	}
 	m.detail.Refresh(s)
-	delete(m.cache.details, detailKey(s))
+	uncache(m, m.cache.details, detailKey(s))
 	return m.describe(s)
 }
 
+// uncache deletes key from a cache, and, at the next save, from the file.
+func uncache[T any](m *Model, c map[string]entry[T], key string) {
+	if _, ok := c[key]; !ok {
+		return
+	}
+	delete(c, key)
+	if m.cacheDropped == nil {
+		m.cacheDropped = map[string]bool{}
+	}
+	m.cacheDropped[key] = true
+	m.cacheDirty = true
+}
+
 // sameListing reports whether a and b list the same: what a list
 // says of an object, not what describing it adds.
 func sameListing(a, b provider.Object) bool {