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/app/(dashboard)/dashboard/channels/_components/edit.tsx

@@ -1,6 +1,7 @@
+// Modified by the independent AgentDesk fork for support reliability and availability.
 "use client"
 
-import { useEffect, useMemo, useState } from "react"
+import { useEffect, useMemo, useState, useSyncExternalStore } from "react"
 import { zodResolver } from "@hookform/resolvers/zod"
 import { Controller, Resolver, useForm, useWatch } from "react-hook-form"
 import { z } from "zod/v4"
@@ -1375,13 +1376,15 @@ function ChannelFormBody({
   )
 }
 
+// The origin cannot change within a document. An explicit server snapshot keeps
+// the generated access links hydration-safe without a state-setting effect.
+const subscribeToOrigin = () => () => {}
+const readBrowserOrigin = () => window.location.origin
+const readServerOrigin = () => ""
+
 function WebAccessGuide({ channelId }: { channelId: string }) {
   const t = useI18n()
-  const [origin, setOrigin] = useState("")
-
-  useEffect(() => {
-    setOrigin(window.location.origin)
-  }, [])
+  const origin = useSyncExternalStore(subscribeToOrigin, readBrowserOrigin, readServerOrigin)
 
   const accessUrl = useMemo(() => {
     if (!origin || !channelId) {