fix(nextcloud-mail-sync): capture occ export output reliably

scripts/nextcloud-mail-sync.sh

@@ -16,7 +16,8 @@ list_mail_accounts() {
   local export_out
 
   # Nextcloud Mail does not provide a list command; export is safe (does not print passwords).
-  if ! export_out=$(/usr/sbin/runuser -u www-data -- php occ mail:account:export "${user_id}" 2>/dev/null); then
+  # Some occ commands emit to stderr; capture both streams so we don't mis-detect "no accounts".
+  if ! export_out=$(/usr/sbin/runuser -u www-data -- php occ mail:account:export "${user_id}" 2>&1); then
     echo "WARN: unable to export mail accounts for ${user_id}; skipping sync for safety" >&2
     return 1
   fi