feat(page): replace move-to-trash confirm dialog with undo toast

Soft-deleting a page no longer opens a "Move this page to trash?"
confirmation modal. The page is moved to trash immediately and the
"Page moved to trash" toast now exposes an inline Undo action that
restores the page via the existing restore flow.

- Add move-to-trash-notification.tsx helper that builds the toast body
  (status text + Undo button) as a ReactNode, so it can be used from the
  non-TSX page-query module.
- useRemovePageMutation: show the toast with a stable id, 8s autoClose,
  and an Undo handler that hides the toast and triggers restore.
- space-tree-node-menu / page-header-menu: call handleDelete directly and
  drop the now-unused useDeletePageModal usage. Permanent delete keeps its
  confirmation modal.
- useRestorePageMutation: read the live tree from the jotai store at
  execution time and insert via a functional updater, so Undo restores
  child pages correctly even after the originating component unmounted.

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

apps/client/src/features/page/components/header/page-header-menu.tsx

@@ -30,7 +30,6 @@ import { notifications } from "@mantine/notifications";
 import { getAppUrl } from "@/lib/config.ts";
 import { extractPageSlugId } from "@/lib";
 import { useTreeMutation } from "@/features/page/tree/hooks/use-tree-mutation.ts";
-import { useDeletePageModal } from "@/features/page/hooks/use-delete-page-modal.tsx";
 import { PageWidthToggle } from "@/features/user/components/page-width-pref.tsx";
 import { Trans, useTranslation } from "react-i18next";
 import ExportModal from "@/components/common/export-modal";
@@ -143,7 +142,6 @@ function PageActionMenu({ readOnly }: PageActionMenuProps) {
   const { data: page, isLoading } = usePageQuery({
     pageId: extractPageSlugId(pageSlug),
   });
-  const { openDeleteModal } = useDeletePageModal();
   const { handleDelete } = useTreeMutation(page?.spaceId ?? "");
   const [exportOpened, { open: openExportModal, close: closeExportModal }] =
     useDisclosure(false);
@@ -189,7 +187,7 @@ function PageActionMenu({ readOnly }: PageActionMenuProps) {
   };
 
   const handleDeletePage = () => {
-    openDeleteModal({ onConfirm: () => handleDelete(page.id) });
+    handleDelete(page.id);
   };
 
   const handleToggleFavorite = () => {