fix(notifications): fetch system_notifications pref lazily

Settings is the only mounted reader of notificationPreferenceOptions,
so a fresh app start (or any session that never visits Settings) left
the cache empty and the muted preference silently fell back to default
"all". Switch the inbox:new handler to ensureQueryData so the value is
fetched on first use and cached for subsequent events.

Co-authored-by: multica-agent <github@multica.ai>

packages/core/realtime/use-realtime-sync.ts

@@ -28,6 +28,7 @@ import {
 } from "../issues/ws-updaters";
 import { onInboxNew, onInboxInvalidate, onInboxIssueStatusChanged, onInboxIssueDeleted } from "../inbox/ws-updaters";
 import { inboxKeys } from "../inbox/queries";
+import { notificationPreferenceOptions } from "../notification-preferences/queries";
 import { workspaceKeys, workspaceListOptions } from "../workspace/queries";
 import { chatKeys } from "../chat/queries";
 import { useChatStore } from "../chat";
@@ -268,7 +269,7 @@ export function useRealtimeSync(
       if (wsId) onIssueLabelsChanged(qc, wsId, issue_id, labels ?? []);
     });
 
-    const unsubInboxNew = ws.on("inbox:new", (p) => {
+    const unsubInboxNew = ws.on("inbox:new", async (p) => {
       const { item } = p as InboxNewPayload;
       if (!item) return;
       const wsId = getCurrentWsId();
@@ -278,6 +279,22 @@ export function useRealtimeSync(
       // styling is enough — no need to interrupt with a banner. `desktopAPI`
       // is injected by the preload script; its absence (web app) skips silently.
       if (typeof document !== "undefined" && document.hasFocus()) return;
+      // Respect the user's system-notification preference. The Settings page
+      // owns the only `useQuery` for this resource, so on a fresh app start
+      // (or any session that hasn't visited Settings) the React Query cache
+      // is empty — using `getQueryData` would silently default to "all" and
+      // ignore the user's saved choice. `ensureQueryData` resolves to the
+      // cached value if present and otherwise fetches once, populating the
+      // cache for subsequent events. On network failure we fall through to
+      // the default ("all") rather than swallow the banner entirely.
+      if (wsId) {
+        try {
+          const prefData = await qc.ensureQueryData(notificationPreferenceOptions(wsId));
+          if (prefData?.preferences?.system_notifications === "muted") return;
+        } catch {
+          // Fall through with default behavior.
+        }
+      }
       // Capture the source workspace slug at emit time. The user may switch
       // workspaces before clicking the banner (macOS Notification Center
       // holds banners), so routing must not read "current slug" at click

packages/core/types/notification-preference.ts

@@ -3,7 +3,8 @@ export type NotificationGroupKey =
   | "status_changes"
   | "comments"
   | "updates"
-  | "agent_activity";
+  | "agent_activity"
+  | "system_notifications";
 
 export type NotificationGroupValue = "all" | "muted";
 

packages/views/locales/en/settings.json

@@ -64,6 +64,12 @@
         "label": "Agent activity",
         "description": "When an agent task completes or fails"
       }
+    },
+    "system": {
+      "title": "System Notifications",
+      "description": "Control native OS notification banners shown when Multica is in the background.",
+      "label": "Show system notifications",
+      "hint": "Show a banner from your operating system for new inbox items when the app isn't focused."
     }
   },
   "tokens": {

packages/views/locales/zh-Hans/settings.json

@@ -64,6 +64,12 @@
         "label": "智能体活动",
         "description": "智能体 task 完成或失败时"
       }
+    },
+    "system": {
+      "title": "系统通知",
+      "description": "控制 Multica 在后台时是否显示操作系统的原生通知横幅。",
+      "label": "显示系统通知",
+      "hint": "App 未获得焦点时，新的收件箱条目通过操作系统弹出通知横幅。"
     }
   },
   "tokens": {

packages/views/settings/components/notifications-tab.tsx

@@ -10,13 +10,16 @@ import { Switch } from "@multica/ui/components/ui/switch";
 import { toast } from "sonner";
 import { useT } from "../../i18n";
 
-const NOTIFICATION_GROUP_KEYS: NotificationGroupKey[] = [
+// Inbox event groups rendered in the per-event toggle list. `system_notifications`
+// is a sibling preference key but lives in its own section below.
+const INBOX_GROUP_KEYS = [
   "assignments",
   "status_changes",
   "comments",
   "updates",
   "agent_activity",
-];
+] as const;
+type InboxGroupKey = (typeof INBOX_GROUP_KEYS)[number];
 
 export function NotificationsTab() {
   const { t } = useT("settings");
@@ -40,8 +43,10 @@ export function NotificationsTab() {
     });
   };
 
+  const systemEnabled = preferences.system_notifications !== "muted";
+
   return (
-    <div className="space-y-4">
+    <div className="space-y-8">
       <section className="space-y-4">
         <div>
           <h2 className="text-sm font-semibold">{t(($) => $.notifications.title)}</h2>
@@ -52,7 +57,7 @@ export function NotificationsTab() {
 
         <Card>
           <CardContent className="divide-y">
-            {NOTIFICATION_GROUP_KEYS.map((key) => {
+            {INBOX_GROUP_KEYS.map((key: InboxGroupKey) => {
               const enabled = preferences[key] !== "muted";
               return (
                 <div
@@ -75,6 +80,32 @@ export function NotificationsTab() {
           </CardContent>
         </Card>
       </section>
+
+      <section className="space-y-4">
+        <div>
+          <h2 className="text-sm font-semibold">{t(($) => $.notifications.system.title)}</h2>
+          <p className="text-sm text-muted-foreground mt-1">
+            {t(($) => $.notifications.system.description)}
+          </p>
+        </div>
+
+        <Card>
+          <CardContent>
+            <div className="flex items-center justify-between">
+              <div className="space-y-0.5 pr-4">
+                <p className="text-sm font-medium">{t(($) => $.notifications.system.label)}</p>
+                <p className="text-xs text-muted-foreground">
+                  {t(($) => $.notifications.system.hint)}
+                </p>
+              </div>
+              <Switch
+                checked={systemEnabled}
+                onCheckedChange={(checked) => handleToggle("system_notifications", checked)}
+              />
+            </div>
+          </CardContent>
+        </Card>
+      </section>
     </div>
   );
 }

server/internal/handler/notification_preference.go

@@ -12,13 +12,18 @@ import (
 )
 
 // validNotifGroups is the set of notification preference group keys that the
-// API accepts. Keys not in this set are rejected.
+// API accepts. Keys not in this set are rejected. `system_notifications` is
+// not an inbox event group — it's a delivery-channel toggle controlling
+// whether native OS notification banners fire — but it shares the same
+// preferences map so a single endpoint covers all user notification
+// preferences.
 var validNotifGroups = map[string]bool{
-	"assignments":    true,
-	"status_changes": true,
-	"comments":       true,
-	"updates":        true,
-	"agent_activity": true,
+	"assignments":          true,
+	"status_changes":       true,
+	"comments":             true,
+	"updates":              true,
+	"agent_activity":       true,
+	"system_notifications": true,
 }
 
 // validNotifValues is the set of allowed preference values per group.