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."]]

src/clj/auto_ap/ssr/invoices.clj

@@ -1486,16 +1486,17 @@
 
 ;; TODO clientize
 (defn all-ids-not-locked [all-ids]
-  (->> all-ids
-       (dc/q '[:find ?i
-               :in $ [?i ...]
-               :where
-               [?i :invoice/client ?c]
-               [(get-else $ ?c :client/locked-until #inst "2000-01-01") ?lu]
-               [?i :invoice/date ?d]
-               [(>= ?d ?lu)]]
-             (dc/db conn))
-       (map first)))
+  (when (seq all-ids)
+    (->> all-ids
+         (dc/q '[:find ?i
+                 :in $ [?i ...]
+                 :where
+                 [?i :invoice/client ?c]
+                 [(get-else $ ?c :client/locked-until #inst "2000-01-01") ?lu]
+                 [?i :invoice/date ?d]
+                 [(>= ?d ?lu)]]
+               (dc/db conn))
+         (map first))))
 (defn- bulk-edit-account-row*
   "One expense-account row (no cursor). The location cell swaps just itself
    (#account-location-<index>, Rule 2); the percentage swaps only #expense-totals