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/workspace/components/settings/components/temporary-note-settings.tsx

@@ -0,0 +1,86 @@
+import { useState } from "react";
+import { useAtom } from "jotai";
+import {
+  Button,
+  Group,
+  NumberInput,
+  Paper,
+  Stack,
+  Text,
+} from "@mantine/core";
+import { notifications } from "@mantine/notifications";
+import { useTranslation } from "react-i18next";
+import useUserRole from "@/hooks/use-user-role.tsx";
+import { workspaceAtom } from "@/features/user/atoms/current-user-atom.ts";
+import { updateWorkspace } from "@/features/workspace/services/workspace-service.ts";
+import { IWorkspace } from "@/features/workspace/types/workspace.types.ts";
+
+// Mirrors DEFAULT_TEMPORARY_NOTE_HOURS on the server. Shown when the workspace
+// has no explicit value configured yet.
+const DEFAULT_TEMPORARY_NOTE_HOURS = 24;
+
+/**
+ * Workspace-level editor for the temporary-note lifetime, in HOURS. The deadline
+ * is frozen per-note at creation, so changing this only affects notes created
+ * afterwards. `temporaryNoteHours` is a top-level workspace column (like
+ * trashRetentionDays), not a nested setting.
+ */
+export default function TemporaryNoteSettings() {
+  const { t } = useTranslation();
+  const [workspace, setWorkspace] = useAtom(workspaceAtom);
+  const { isAdmin } = useUserRole();
+  const [isLoading, setIsLoading] = useState(false);
+  const [value, setValue] = useState<number>(
+    workspace?.temporaryNoteHours ?? DEFAULT_TEMPORARY_NOTE_HOURS,
+  );
+
+  async function handleSave() {
+    if (!value || value < 1) return;
+    setIsLoading(true);
+    try {
+      const updated = await updateWorkspace({
+        temporaryNoteHours: value,
+      } as Partial<IWorkspace>);
+      setWorkspace({ ...updated, temporaryNoteHours: value });
+      notifications.show({ message: t("Updated successfully") });
+    } catch (err) {
+      notifications.show({
+        message:
+          (err as any)?.response?.data?.message ?? t("Failed to update data"),
+        color: "red",
+      });
+    } finally {
+      setIsLoading(false);
+    }
+  }
+
+  return (
+    <Stack mt="sm">
+      <Text fw={700} size="lg">
+        {t("Temporary notes")}
+      </Text>
+
+      <Paper withBorder radius="md" p="lg">
+        <Text size="xs" c="dimmed" mb="xs">
+          {t(
+            "A temporary note is automatically moved to trash after this many hours unless it is made permanent. The deadline is fixed when the note is created.",
+          )}
+        </Text>
+        <NumberInput
+          label={t("Temporary note lifetime (hours)")}
+          min={1}
+          allowDecimal={false}
+          value={value}
+          onChange={(v) => setValue(typeof v === "number" ? v : Number(v))}
+          disabled={!isAdmin || isLoading}
+          w={220}
+        />
+        <Group justify="flex-end" mt="md">
+          <Button onClick={handleSave} loading={isLoading} disabled={!isAdmin}>
+            {t("Save")}
+          </Button>
+        </Group>
+      </Paper>
+    </Stack>
+  );
+}

apps/client/src/features/workspace/types/workspace.types.ts

@@ -28,6 +28,8 @@ export interface IWorkspace {
   aiDictationStreaming?: boolean;
   aiPublicShareAssistant?: boolean;
   trashRetentionDays?: number;
+  // Default lifetime (HOURS) for new temporary notes; frozen per-note at creation.
+  temporaryNoteHours?: number;
   restrictApiToAdmins?: boolean;
   allowMemberTemplates?: boolean;
   isScimEnabled?: boolean;