feat: Implement core chat application UI, including chat, voice, members, DMs, and shared components.

packages/shared/src/App.jsx

@@ -1,4 +1,4 @@
-import React, { useState, useEffect, useRef } from 'react';
+import React, { useState, useEffect } from 'react';
 import { Routes, Route, Navigate, useLocation, useNavigate } from 'react-router-dom';
 import Login from './pages/Login';
 import Register from './pages/Register';
@@ -62,21 +62,18 @@ function AuthGuard({ children }) {
     return () => { cancelled = true; };
   }, []);
 
-  // Redirect once after auth state is determined (not on every route change)
-  const hasRedirected = useRef(false);
-
   useEffect(() => {
-    if (authState === 'loading' || hasRedirected.current) return;
-    hasRedirected.current = true;
+    if (authState === 'loading') return;
 
     const isAuthPage = location.pathname === '/' || location.pathname === '/register';
+    const hasSession = sessionStorage.getItem('privateKey') && sessionStorage.getItem('signingKey');
 
-    if (authState === 'authenticated' && isAuthPage) {
+    if (hasSession && isAuthPage) {
       navigate('/chat', { replace: true });
-    } else if (authState === 'unauthenticated' && !isAuthPage) {
+    } else if (!hasSession && !isAuthPage) {
       navigate('/', { replace: true });
     }
-  }, [authState]);
+  }, [authState, location.pathname]);
 
   if (authState === 'loading') {
     return (