feat: ui.recentIcon marks items used lately with ◷, and lazysecrets list --recent

docs/config.md

@@ -9,6 +9,7 @@ it isn't there yet); changes apply when lazysecrets starts again.
 ```yaml
 ui:
   icons: true            # Nerd Font icons (v3+); also --icons=false or LAZYSECRETS_ICONS=0
+  recentIcon: false      # mark items used lately (Recent, R) with ◷, here and in lazysecrets list
   sourcesView: grouped   # or flat; ` toggles it
   collapseGroups: true   # start with the Sources pane's groups folded; enter or space unfolds one
   loadDelay: 150ms       # how long the cursor rests on a row before it loads; 0s loads at once