Migration: remove libayatana-appindicator, which cline-desktop needed

CoreDesktop installed it to build cline-desktop, which cline-desktop-bin
has since replaced, so machines installed before kept it where a fresh
install has none. Found by 30-upgrade-from-baseline at 0c0ddf5.

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

migrations/1793990879.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+# CoreDesktop installed libayatana-appindicator for building cline-desktop,
+# which cline-desktop-bin has since replaced. Remove it once, unless something
+# else needs it: then leave it to go with that, as an orphan.
+pkg=libayatana-appindicator
+
+# The exact name: pacman -Q also matches a package that only provides it
+[ "$(pacman -Qq "$pkg" 2> /dev/null)" = "$pkg" ] || exit 0
+
+if [ "$(LC_ALL=C pacman -Qi "$pkg" | awk -F' *: *' '/^Required By/ { print $2 }')" != "None" ]; then
+  sudo pacman -D --asdeps "$pkg" > /dev/null
+  exit
+fi
+
+echo "Removing $pkg..."
+sudo pacman -Rns --noconfirm "$pkg"