Fix router guard broken cookie check to use isLuciaLoggedIn cookie

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/router/routerGuard.test.js

@@ -0,0 +1,39 @@
+import { describe, it, expect, beforeEach } from 'vitest';
+
+describe('router beforeEach guard logic', () => {
+  beforeEach(() => {
+    // Clear cookies
+    document.cookie.split(';').forEach((c) => {
+      const name = c.split('=')[0].trim();
+      if (name) {
+        document.cookie = name + '=; Max-Age=-99999999; path=/';
+      }
+    });
+  });
+
+  // Simulate the guard logic from router/index.ts
+  function runGuard(to) {
+    const isLoggedIn = document.cookie
+      .split(';')
+      .some((c) => c.trim().startsWith('isLuciaLoggedIn='));
+
+    if (to.name === 'Login') {
+      if (isLoggedIn) return { name: 'Files' };
+    }
+    return undefined;
+  }
+
+  it('redirects logged-in user from Login to Files', () => {
+    document.cookie = 'isLuciaLoggedIn=true';
+    expect(runGuard({ name: 'Login' })).toEqual({ name: 'Files' });
+  });
+
+  it('allows unauthenticated user to visit Login', () => {
+    expect(runGuard({ name: 'Login' })).toBeUndefined();
+  });
+
+  it('does not interfere with non-Login routes', () => {
+    document.cookie = 'isLuciaLoggedIn=true';
+    expect(runGuard({ name: 'Files' })).toBeUndefined();
+  });
+});