feat: add support chat widget demo and state management

- Implemented SupportWidgetDemo component for configuring and mounting the support chat widget.
- Introduced Zustand store for managing support chat state, including message handling and socket connection.
- Created support host bridge for communication between the widget and parent window.
- Added utility functions for JWT token generation and local storage management.
- Enhanced user experience with notifications for new messages and chat status updates.

web/app/dashboard/channels/_components/edit.tsx

@@ -7,7 +7,7 @@ import { z } from "zod/v4"
 import { CopyIcon, ExternalLinkIcon } from "lucide-react"
 import { toast } from "sonner"
 
-import { getWidgetDemoPath } from "@/components/kefu/demo-navigation"
+import { getWidgetDemoPath } from "@/components/support-chat/demo-navigation"
 import { OptionCombobox } from "@/components/option-combobox"
 import { ProjectDialog } from "@/components/project-dialog"
 import { Button } from "@/components/ui/button"

web/app/support/chat/closed/page.tsx

@@ -14,9 +14,9 @@ export default function Page() {
           <CheckCircle2Icon className="size-7" />
         </div>
         <div className="grid gap-2">
-          <h1 className="text-lg font-semibold text-foreground">{t("kefu.closedTitle")}</h1>
+          <h1 className="text-lg font-semibold text-foreground">{t("supportChat.closedTitle")}</h1>
           <p className="text-sm leading-6 text-muted-foreground">
-            {t("kefu.closedDescription")}
+            {t("supportChat.closedDescription")}
           </p>
         </div>
       </section>

web/app/support/chat/page.tsx

@@ -1,5 +1,5 @@
-import { KefuChatShell } from "@/components/kefu/chat-shell"
+import { SupportChatShell } from "@/components/support-chat/chat-shell"
 
 export default function Page() {
-  return <KefuChatShell />
+  return <SupportChatShell />
 }

web/app/support/demo/page.tsx

@@ -1,5 +1,5 @@
-import { KefuWidgetDemo } from "@/components/kefu/widget-demo"
+import { SupportWidgetDemo } from "@/components/support-chat/widget-demo"
 
 export default function Page() {
-  return <KefuWidgetDemo />
+  return <SupportWidgetDemo />
 }