Add optional export notifications (#3935)

* Add `emails.export_completed` notification to settings menu

Signed-off-by: AKP <tom@tdpain.net>

* Don't send email when export_completed notifications are disabled

Signed-off-by: AKP <tom@tdpain.net>

* Automatically subscribe new users to `export_completed` notifications

Signed-off-by: AKP <tom@tdpain.net>

* Alter secondary text on export page to mention optional notifications

Signed-off-by: AKP <tom@tdpain.net>

* Alter toast text on collection export for optional notifications

Signed-off-by: AKP <tom@tdpain.net>

* Only subscribe new admins to export notifs

Signed-off-by: AKP <tom@tdpain.net>

* Move `export_completed` notification decision into `beforeSend`

Signed-off-by: AKP <tom@tdpain.net>

* Update server/emails/templates/ExportFailureEmail.tsx

Co-authored-by: Tom Moor <tom.moor@gmail.com>

* Update server/emails/templates/ExportSuccessEmail.tsx

Co-authored-by: Tom Moor <tom.moor@gmail.com>

Signed-off-by: AKP <tom@tdpain.net>
Co-authored-by: Tom Moor <tom.moor@gmail.com>

app/scenes/CollectionExport.tsx

@@ -25,7 +25,9 @@ function CollectionExport({ collection, onSubmit }: Props) {
 
       setIsLoading(false);
       showToast(
-        t("Export started, you will receive an email when it’s complete.")
+        t(
+          "Export started. If you have notifications enabled, you will receive an email when it's complete."
+        )
       );
       onSubmit();
     },

app/scenes/Settings/Export.tsx

@@ -56,7 +56,7 @@ function Export() {
       <Heading>{t("Export")}</Heading>
       <Text type="secondary">
         <Trans
-          defaults="A full export might take some time, consider exporting a single document or collection. The exported data is a zip of your documents in Markdown format. You may leave this page once the export has started – we will email a link to <em>{{ userEmail }}</em> when it’s complete."
+          defaults="A full export might take some time, consider exporting a single document or collection. The exported data is a zip of your documents in Markdown format. You may leave this page once the export has started – if you have notifications enabled, we will email a link to <em>{{ userEmail }}</em> when it’s complete."
           values={{
             userEmail: user.email,
           }}

app/scenes/Settings/Notifications.tsx

@@ -51,6 +51,13 @@ function Notifications() {
         "Receive a notification when someone you invited creates an account"
       ),
     },
+    {
+      event: "emails.export_completed",
+      title: t("Export completed"),
+      description: t(
+        "Receive a notification when an export you requested has been completed"
+      ),
+    },
     {
       visible: isCloudHosted,
       event: "emails.onboarding",