feat: harden support, localize knowledge and add operator availability [skip ci]

Source-only publication of reviewed commit 64e96a7f423673dc29ad56485be9fc79bce8af1c.

Passed in isolation: focused frontend/backend tests, race checks, TypeScript typecheck, lint, Go compilation, Flowgram build, and deterministic SDK build/tests.

Not accepted as a production release: Next.js export/native assembly remains blocked by environment memory limits; browser interaction and MySQL staging acceptance remain unverified. No production server, database/schema, runtime configuration, deployment, release tag, or workflow execution was performed.

Expected source tree: 0a4a7528e9.

web/components/notification-provider.tsx

@@ -1,3 +1,4 @@
+// Modified by the independent AgentDesk fork for support reliability and availability.
 "use client"
 
 import {
@@ -73,10 +74,14 @@ export function NotificationProvider({ children }: { children: ReactNode }) {
 
   useEffect(() => {
     currentUserIdRef.current = readSession()?.user.id ?? 0
-    void refreshUnreadCount().catch(() => {
-      setUnreadCount(0)
+    let active = true
+    void fetchNotificationUnreadCount().then((result) => {
+      if (active) setUnreadCount(result.unreadCount)
+    }).catch(() => {
+      if (active) setUnreadCount(0)
     })
-  }, [refreshUnreadCount])
+    return () => { active = false }
+  }, [])
 
   useEffect(() => {
     const realtime = createRealtimeConnectionManager({