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/expiry.go

@@ -1,9 +1,10 @@
 package app
 
 import (
-	"fmt"
 	"time"
 
+	"git.kebcloud.no/keb/lazysecrets/internal/expiry"
+
 	"git.kebcloud.no/keb/lazysecrets/internal/provider"
 )
 
@@ -11,28 +12,18 @@ import (
 // list once they have expired (✗ expired) or will within the configured
 // warning period (⚠ 12d), and typing "expir" in the filter finds them.
 
-type expiryState int
+type expiryState = expiry.State
 
 const (
-	notExpiring expiryState = iota
-	expiresSoon
-	expired
+	notExpiring = expiry.None
+	expiresSoon = expiry.Soon
+	expired     = expiry.Expired
 )
 
 // expiry tells whether o has expired or will within the warning period,
 // and how long it has left.
 func (m Model) expiry(o provider.Object) (expiryState, time.Duration) {
-	if o.Expires.IsZero() {
-		return notExpiring, 0
-	}
-	left := o.Expires.Sub(m.now())
-	switch {
-	case left <= 0:
-		return expired, 0
-	case left <= m.expiryWarning:
-		return expiresSoon, left
-	}
-	return notExpiring, left
+	return expiry.Of(o.Expires, m.now(), m.expiryWarning)
 }
 
 // expiryWord is matched by the filter: "expired" or "expiring".
@@ -47,9 +38,4 @@ func (m Model) expiryWord(o provider.Object) string {
 }
 
 // daysLeft is a short "12d", or "5h" on the last day.
-func daysLeft(d time.Duration) string {
-	if d < 24*time.Hour {
-		return fmt.Sprintf("%dh", max(1, int(d.Hours())))
-	}
-	return fmt.Sprintf("%dd", int(d.Hours()/24))
-}
+func daysLeft(d time.Duration) string { return expiry.Left(d) }