Persist relative return-to path for post-login redirect

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

src/views/MainContainer.vue

@@ -49,6 +49,7 @@ export default {
     // }
   async beforeRouteEnter(to, from, next) {
     const loginStore = useLoginStore();
+    const relativeReturnTo = `${window.location.pathname}${window.location.search}${window.location.hash}`;
 
     if (!getCookie("isLuciaLoggedIn")) {
       if (getCookie('luciaRefreshToken')) {
@@ -61,7 +62,7 @@ export default {
           next({
             path: '/login',
             query: {
-              'return-to': btoa(window.location.href),
+              'return-to': btoa(relativeReturnTo),
             }
           });
         }
@@ -69,7 +70,7 @@ export default {
         next({
           path: '/login',
           query: {
-            'return-to': btoa(window.location.href),
+            'return-to': btoa(relativeReturnTo),
           }
         });
       }