fix(ssr): bulk-edit empty-selection 500 + modal-footer EDN leak

- BUG D: clicking "Bulk Edit" with no invoices selected 500'd. selected->ids
  returns nil with no selection, and all-ids-not-locked fed that nil into a
  Datomic `:in $ [?i ...]` query ("Unable to find data source"). Guard the body
  with (when (seq all-ids) ...) so an empty selection yields [] and the modal
  opens cleanly. Verified live: no "Oh, drat" toast, no 500.

- BUG B: modal-footer- called (hx/alpine-appear ...) twice; the 2nd return value
  (an attribute map) landed in child position and rendered as literal EDN
  ({:x-show ...}) in the red error banner whenever unexpectedError flipped true.
  Delete the duplicate. Verified: rendered HTML now has one alpine-appear and no
  EDN-text child. (Pre-existing defect, also present on master.)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/clj/auto_ap/ssr/components/dialog.clj

@@ -55,7 +55,6 @@
 (defn modal-footer- [params & children]
   [:div {:class "p-4 border-t"}
    [:span.items-center.bg-red-100.text-red-800.text-xs.font-medium.mb-2.p-1.rounded-full.inline-flex
-    (hx/alpine-appear {:x-show "unexpectedError" :class "dark:bg-red-900 dark:text-red-300"})
     (hx/alpine-appear {:x-show "unexpectedError" :class "dark:bg-red-900 dark:text-red-300"})
     [:span {:class "w-2 h-2 bg-red-500 rounded-full"}]
     [:span.px-2.py-0.5 "An unexpected error has occured. Integreat staff have been notified."]]