fix: improve login flow with extended wait time

- Update login.html to wait 4 seconds before dashboard redirect
- Give Blazor time to initialize and read auth token from localStorage
- Simplify redirect flow (remove auth-redirect.html)
- Fix token storage in localStorage for auth state

Issue: Dashboard access still redirecting to /not-found
Root cause: Token from static HTML not being picked up by Blazor auth
Next steps: Implement server-side cookie-based auth or refactor to Blazor login

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

login-test.mjs

@@ -0,0 +1,44 @@
+import { chromium } from '@playwright/test';
+
+(async () => {
+  const browser = await chromium.launch();
+  const page = await browser.newPage();
+  
+  try {
+    await page.goto('http://localhost:5265/login');
+    
+    await page.fill('input[name="username"]', 'admin');
+    await page.fill('input[name="password"]', 'admin');
+    await page.click('button[type="submit"]');
+    
+    console.log('✓ Login form submitted');
+    console.log('✓ Waiting 3 seconds for dashboard redirect...');
+    
+    await page.waitForNavigation({ waitUntil: 'load', timeout: 10000 });
+    
+    const url = page.url();
+    const content = await page.content();
+    
+    console.log(`✓ Navigation complete`);
+    console.log(`  URL: ${url}`);
+    
+    if (url.includes('/dashboard')) {
+        if (content.includes('Not Found')) {
+            console.log('✗ Dashboard URL but Not Found error');
+        } else if (content.includes('관리자 대시보드')) {
+            console.log('✓✓✓ SUCCESS: Dashboard fully loaded!');
+        } else {
+            console.log('✓ Dashboard page loaded (content check)');
+        }
+    } else {
+        console.log('⚠ Not on dashboard URL');
+    }
+    
+    await page.screenshot({ path: './login-final-screenshot.png' });
+    
+  } catch (e) {
+    console.error('Test error:', e.message.substring(0, 70));
+  }
+  
+  await browser.close();
+})();