fix(desktop): use correct store path in chat widgets

ChatWidget and ChatFloatingWidget were using relative path
"machine-agent.json" instead of the full path with appLocalDataDir().
This caused "Maquina nao registrada" error in chat window.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/desktop/src/chat/ChatWidget.tsx

@@ -2,9 +2,12 @@ import { useCallback, useEffect, useRef, useState } from "react"
 import { invoke } from "@tauri-apps/api/core"
 import { listen } from "@tauri-apps/api/event"
 import { Store } from "@tauri-apps/plugin-store"
+import { appLocalDataDir, join } from "@tauri-apps/api/path"
 import { Send, X, Minus, Loader2, Headphones } from "lucide-react"
 import type { ChatMessage, ChatMessagesResponse, SendMessageResponse } from "./types"
 
+const STORE_FILENAME = "machine-agent.json"
+
 interface ChatWidgetProps {
   ticketId: string
 }
@@ -34,7 +37,9 @@ export function ChatWidget({ ticketId }: ChatWidgetProps) {
   // Carregar configuracao do store
   const loadConfig = useCallback(async () => {
     try {
-      const store = await Store.load("machine-agent.json")
+      const appData = await appLocalDataDir()
+      const storePath = await join(appData, STORE_FILENAME)
+      const store = await Store.load(storePath)
       const token = await store.get<string>("token")
       const config = await store.get<{ apiBaseUrl: string }>("config")