Add bundles, relinking and repair of updated entries

- bundle: move a binary and its companion files into their own folder,
  picking the main executable with --main, zenity or kdialog
- relink: point an entry at a different executable
- repair: follow AppImages that were renamed or replaced by an update,
  matched by update info, embedded desktop id or version-stripped name

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

packaging/arch/PKGBUILD

@@ -11,6 +11,7 @@ optdepends=(
   'thunar: context menu integration'
   'desktop-file-utils: refresh the menu cache after changes'
   'libnotify: notifications from context menu actions'
+  'zenity: choose the main binary when a bundle has several executables'
 )
 options=('!lto')