feat: page update notifications (#2074)

* feat: watchers notification and email preferences

* fix: email copy

* digests

* clean up

* fix

* clean up

* move backlinks queue-up to history processor

* fix

* fix keys

* feat: group notifications

* filter

* adjust email digest window

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

@@ -3,6 +3,8 @@ import {
   IconArrowRight,
   IconArrowsHorizontal,
   IconDots,
+  IconEye,
+  IconEyeOff,
   IconFileExport,
   IconHistory,
   IconLink,
@@ -40,6 +42,11 @@ import { PageStateSegmentedControl } from "@/features/user/components/page-state
 import MovePageModal from "@/features/page/components/move-page-modal.tsx";
 import { useTimeAgo } from "@/hooks/use-time-ago.tsx";
 import { PageShareModal } from "@/ee/page-permission";
+import {
+  useWatchStatusQuery,
+  useWatchPageMutation,
+  useUnwatchPageMutation,
+} from "@/features/page/queries/watcher-query";
 
 interface PageHeaderMenuProps {
   readOnly?: boolean;
@@ -123,6 +130,9 @@ function PageActionMenu({ readOnly }: PageActionMenuProps) {
   ] = useDisclosure(false);
   const [pageEditor] = useAtom(pageEditorAtom);
   const pageUpdatedAt = useTimeAgo(page?.updatedAt);
+  const { data: watchStatus } = useWatchStatusQuery(page?.id);
+  const watchPage = useWatchPageMutation();
+  const unwatchPage = useUnwatchPageMutation();
 
   const handleCopyLink = () => {
     const pageUrl =
@@ -185,6 +195,23 @@ function PageActionMenu({ readOnly }: PageActionMenuProps) {
           >
             {t("Copy as Markdown")}
           </Menu.Item>
+
+          {watchStatus?.watching ? (
+            <Menu.Item
+              leftSection={<IconEyeOff size={16} />}
+              onClick={() => unwatchPage.mutate(page.id)}
+            >
+              {t("Stop watching")}
+            </Menu.Item>
+          ) : (
+            <Menu.Item
+              leftSection={<IconEye size={16} />}
+              onClick={() => watchPage.mutate(page.id)}
+            >
+              {t("Watch page")}
+            </Menu.Item>
+          )}
+
           <Menu.Divider />
 
           <Menu.Item leftSection={<IconArrowsHorizontal size={16} />}>