feat(page): temporary notes — auto-trash after X hours unless made permanent (#201)

"Temporary notes" with a death timer: created via a dedicated hourglass button
in the space-tree header, a note auto-moves to Trash after a configurable X
hours (default 24) unless explicitly made permanent ("structure or die").

Reuses existing mechanisms, mirroring is_template and the trash-cleanup job:
- New nullable column pages.temporary_expires_at (NULL = permanent; non-NULL =
  frozen deadline) + partial index for the sweep; workspace column
  temporary_note_hours (default via DEFAULT_TEMPORARY_NOTE_HOURS = 24).
- create-page DTO `temporary` flag; the deadline is frozen at creation so later
  setting changes never reschedule existing notes.
- POST /pages/toggle-temporary (mirror of toggle-template): arm/clear the timer,
  CASL-guarded via validateCanEdit, cross-workspace NotFound defense-in-depth.
- TemporaryNoteCleanupService: hourly @Interval sweep that soft-deletes expired
  notes through the exact PageRepo.removePage path (recursive over children,
  emits PAGE_SOFT_DELETED), attributed to the creator; idempotent via
  deletedAt IS NULL filters.
- restorePage clears temporary_expires_at so a restored note can't be re-trashed.
- Workspace setting temporary_note_hours (audit-tracked) + a hours editor in
  workspace General settings.
- Client: second create button, orange tree icon, tree + page-header menu toggle
  ("Make temporary"/"Make permanent"), an open-note banner with a rescue action,
  and en/ru i18n.

Tests (unit): toggle-temporary controller (toggle/explicit/permission/cross-ws +
DTO validation), cleanup-job sweep (selection filters, per-note removePage,
error isolation), and a migration up/down sanity. Server tsc, client tsc -b,
and the page+workspace jest suites are green.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/client/src/features/page/tree/components/space-tree-node-menu.tsx

@@ -6,6 +6,7 @@ import { useDisclosure } from "@mantine/hooks";
 import { notifications } from "@mantine/notifications";
 import {
   IconArrowRight,
+  IconClockHour4,
   IconCopy,
   IconDotsVertical,
   IconFileExport,
@@ -30,7 +31,10 @@ import {
   useRemoveFavoriteMutation,
 } from "@/features/favorite/queries/favorite-query";
 
-import { useToggleTemplateMutation } from "@/features/page-embed/queries/page-embed-query";
+import {
+  useToggleTemplateMutation,
+  useToggleTemporaryMutation,
+} from "@/features/page-embed/queries/page-embed-query";
 import { treeDataAtom } from "@/features/page/tree/atoms/tree-data-atom.ts";
 import { treeModel } from "@/features/page/tree/model/tree-model";
 import { useTreeMutation } from "@/features/page/tree/hooks/use-tree-mutation.ts";
@@ -65,6 +69,8 @@ export function NodeMenu({ node, canEdit }: NodeMenuProps) {
   const isFavorited = favoriteIds.has(node.id);
   const toggleTemplate = useToggleTemplateMutation();
   const isTemplate = !!node.isTemplate;
+  const toggleTemporary = useToggleTemporaryMutation();
+  const isTemporary = !!node.temporaryExpiresAt;
 
   const handleToggleTemplate = async () => {
     const next = !isTemplate;
@@ -84,6 +90,29 @@ export function NodeMenu({ node, canEdit }: NodeMenuProps) {
     }
   };
 
+  const handleToggleTemporary = async () => {
+    const next = !isTemporary;
+    try {
+      const res = await toggleTemporary.mutateAsync({
+        pageId: node.id,
+        temporary: next,
+      });
+      // Reflect the new deadline locally so the icon/menu update immediately.
+      setData((prev) =>
+        treeModel.update(prev, node.id, {
+          temporaryExpiresAt: res.temporaryExpiresAt,
+        } as any),
+      );
+      notifications.show({
+        message: next
+          ? t("Note will move to trash unless made permanent")
+          : t("Note is now permanent"),
+      });
+    } catch {
+      // mutation surfaces the error via notifications
+    }
+  };
+
   const handleCopyLink = () => {
     const pageUrl =
       getAppUrl() + buildPageUrl(spaceSlug, node.slugId, node.name);
@@ -248,6 +277,17 @@ export function NodeMenu({ node, canEdit }: NodeMenuProps) {
                 {isTemplate ? t("Unset as template") : t("Make template")}
               </Menu.Item>
 
+              <Menu.Item
+                leftSection={<IconClockHour4 size={16} />}
+                onClick={(e) => {
+                  e.preventDefault();
+                  e.stopPropagation();
+                  handleToggleTemporary();
+                }}
+              >
+                {isTemporary ? t("Make permanent") : t("Make temporary")}
+              </Menu.Item>
+
               <Menu.Divider />
               <Menu.Item
                 c="red"