Only check for pending migrations at login

omarchy-update-user-notify.path watched /usr/share/omarchy/migrations, but
pacman writes that directory during every update, including the blessed
omarchy update, which runs omarchy-migrate a step later. The watcher fired a
critical notification for the migrations the update was already applying in
the visible terminal. A watcher cannot tell that apart from a bypassed
pacman -Syu, so the only trigger that never collides with a running update is
a once-per-login check.

The service that already ran at graphical-session.target is now the whole
mechanism, renamed after the command it runs. That is also all the second-user
case needs: markers are per-user, so anyone who did not run the update finds
them missing at their next login.

Login timing means the toast can be sent before the shell has claimed
org.freedesktop.Notifications, so the notifier waits for a live server first.
The wait is omarchy-first-run's, lifted into omarchy-notification-wait rather
than duplicated.

The package keeps omarchy-update-user-notify.service as a symlink onto the new
unit. Existing users hold an absolute wants symlink to the old path, and the
migration that repoints it only runs for users who run an update, which is the
opposite of who the notifier is for.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

bin/omarchy-first-run

@@ -53,37 +53,6 @@ log_first_run() {
   printf '[%s] %s\n' "$(date '+%Y-%m-%d %H:%M:%S')" "$*" >>"$FIRST_RUN_LOG"
 }
 
-notification_server_ready() {
-  if omarchy-cmd-present gdbus; then
-    gdbus call --session \
-      --dest org.freedesktop.Notifications \
-      --object-path /org/freedesktop/Notifications \
-      --method org.freedesktop.Notifications.GetServerInformation >/dev/null 2>&1
-  elif omarchy-cmd-present busctl; then
-    busctl --user call \
-      org.freedesktop.Notifications \
-      /org/freedesktop/Notifications \
-      org.freedesktop.Notifications \
-      GetServerInformation >/dev/null 2>&1
-  else
-    return 0
-  fi
-}
-
-wait_for_notifications() {
-  omarchy-cmd-present omarchy-shell || return 0
-
-  for _ in {1..100}; do
-    if omarchy-shell notifications ping >/dev/null 2>&1 && notification_server_ready; then
-      return 0
-    fi
-    sleep 0.1
-  done
-
-  log_first_run "Timed out waiting for notification service; continuing"
-  return 0
-}
-
 run_first_run_step() {
   local name="$1"
   shift
@@ -98,12 +67,6 @@ run_first_run_step() {
   fi
 }
 
-wait_for_notifications
-
-run_first_run_step "enable migration notification watcher" \
-  systemctl --user enable --now omarchy-update-user-notify.path
-run_first_run_step "notify about pending migrations" omarchy-migrate-notify
-
 run_first_run_step "install Voxtype post-update hook" \
   omarchy-hook-install post-update "$OMARCHY_PATH/install/user/first-run/install-voxtype.hook"
 run_first_run_step "install fingerprint setup post-update hook" \
@@ -118,7 +81,7 @@ run_first_run_step "set GTK primary paste" \
 run_first_run_step "apply speaker tuning" \
   bash "$OMARCHY_PATH/install/user/first-run/audio-tuning.sh"
 
-wait_for_notifications
+omarchy-notification-wait || log_first_run "Timed out waiting for notification service; continuing"
 run_first_run_step "show welcome notification" \
   bash "$OMARCHY_PATH/install/user/first-run/welcome.sh"
 # The first-run notification scripts register action callbacks in background