feat: integrate Better Auth and enhance authentication flow

- Added Better Auth integration to the web application, allowing for dual login support with both custom and Better Auth systems.
- Updated authentication client configuration to dynamically set the base URL based on the environment.
- Enhanced chat components to utilize user authentication status, improving user experience and security.
- Refactored various components to support Better Auth, including error handling and user identity management.
- Improved notification handling and user feedback mechanisms during authentication processes.

apps/web/src/lib/hooks/useConvexWithAuth.ts

@@ -0,0 +1,45 @@
+/**
+ * Hook personalizado que garante autenticação no Convex
+ * 
+ * Este hook substitui useConvexClient e garante que o token seja sempre passado
+ * 
+ * NOTA: Este hook deve ser usado dentro de componentes Svelte com $effect
+ */
+
+import { useConvexClient } from "convex-svelte";
+import { authStore } from "$lib/stores/auth.svelte";
+
+interface ConvexClientWithAuth {
+  setAuth?: (token: string) => void;
+  clearAuth?: () => void;
+}
+
+/**
+ * Hook que retorna cliente Convex com autenticação configurada automaticamente
+ * 
+ * IMPORTANTE: Use $effect() no componente para chamar esta função:
+ * ```svelte
+ * $effect(() => {
+ *   useConvexWithAuth();
+ * });
+ * ```
+ */
+export function useConvexWithAuth() {
+  const client = useConvexClient();
+  const token = authStore.token;
+  const clientWithAuth = client as ConvexClientWithAuth;
+  
+  // Configurar token se disponível
+  if (clientWithAuth && typeof clientWithAuth.setAuth === "function" && token) {
+    try {
+      clientWithAuth.setAuth(token);
+      if (import.meta.env.DEV) {
+        console.log("✅ [useConvexWithAuth] Token configurado:", token.substring(0, 20) + "...");
+      }
+    } catch (e) {
+      console.warn("⚠️ [useConvexWithAuth] Erro ao configurar token:", e);
+    }
+  }
+  
+  return client;
+}