Clear refresh token cookie during logout to enforce full session termination

Co-Authored-By: Codex <codex@openai.com>

src/stores/login.ts

@@ -106,6 +106,7 @@ export const useLoginStore = defineStore("loginStore", {
      */
     logOut() {
       deleteCookie("luciaToken");
+      deleteCookie("luciaRefreshToken");
 
       this.isLoggedIn = false;
       deleteCookie("isLuciaLoggedIn");