feat(telemetry): opt-in admin alert pushes

- telemetryAlerts metadata flag, admin-gated server fn
- alerts sent only to admins with the flag enabled
- settings toggle visible to admins only, under device notifications

src/features/settings/server.ts

@@ -1,5 +1,8 @@
 import { createServerFn } from "@tanstack/react-start";
-import { superTokensFunctionMiddleware } from "@/utils/supertokens";
+import {
+  superTokensAdminFunctionMiddleware,
+  superTokensFunctionMiddleware,
+} from "@/utils/supertokens";
 
 // Whitelists: these values flow into Mantine's primaryColor / the
 // data-mantine-color-scheme attribute — an unknown value crash-loops or
@@ -139,3 +142,26 @@ export const updateUserAccentColor = createServerFn({ method: "POST" })
       },
     };
   });
+
+export const updateUserTelemetryAlerts = createServerFn({ method: "POST" })
+  .validator((data: boolean) => data === true)
+  .middleware([superTokensAdminFunctionMiddleware])
+  .handler(async ({ context, data }) => {
+    const { userAuthId, metadata } = context;
+    if (!userAuthId) return;
+
+    const { updateUserMetadataFields } = await import(
+      "@/utils/supertokens-core.server"
+    );
+
+    await updateUserMetadataFields(userAuthId, {
+      telemetryAlerts: data,
+    });
+
+    return {
+      metadata: {
+        ...metadata,
+        telemetryAlerts: data,
+      },
+    };
+  });