Avoid file conflict with walker package for config.toml

walker owns /etc/xdg/walker/config.toml and overwrites it on every
update. Instead of fighting for that path, deploy our config override
to user homes (~/.config/walker/) via the .install hook where XDG
lookup finds it first. Also fix stale rofi dependency → walker + elephant.

moonarch-git/moonarch.install

@@ -19,6 +19,19 @@ post_install() {
         cp /usr/share/moonarch/moongreet/moongreet.toml /etc/moongreet/moongreet.toml
     fi
 
+    # Deploy Walker config override to skel and existing user homes.
+    # Only copies if user has no config yet — never overwrites manual edits.
+    install -Dm644 /usr/share/moonarch/walker-config.toml \
+        /etc/skel/.config/walker/config.toml
+    while IFS=: read -r _ _ uid gid _ home _; do
+        if [ "$uid" -ge 1000 ] && [ "$uid" -lt 60000 ] && [ -d "$home" ]; then
+            if [ ! -f "$home/.config/walker/config.toml" ]; then
+                install -Dm644 -o "$uid" -g "$gid" /usr/share/moonarch/walker-config.toml \
+                    "$home/.config/walker/config.toml"
+            fi
+        fi
+    done < /etc/passwd
+
     # Cleanup legacy /usr/local/bin/ scripts from pre-package installs
     rm -f /usr/local/bin/moonarch-* 2>/dev/null || true
     rm -f /usr/local/bin/swww /usr/local/bin/swww-daemon 2>/dev/null || true