fix(admin): log login response details

src/TaxBaik.Web/wwwroot/js/admin-session.js

@@ -1,14 +1,3 @@
-// Debug 환경에서 .pdb 파일 요청 차단 (WASM 부팅 최적화)
-if (window.taxbaikBlockPdb) {
-    const originalFetch = window.fetch;
-    window.fetch = function(url, ...args) {
-        if (typeof url === 'string' && url.includes('.pdb')) {
-            return Promise.reject(new TypeError('Blocked: pdb'));
-        }
-        return originalFetch.apply(window, [url, ...args]);
-    };
-}
-
 window.taxbaikAdminSession = {
     clientLogState: {
         enabled: true,
@@ -218,6 +207,30 @@ window.taxbaikAdminSession = {
         }
     },
 
+    getLocalStorageItem: function (key) {
+        try {
+            return localStorage.getItem(key);
+        } catch {
+            return null;
+        }
+    },
+
+    setLocalStorageItem: function (key, value) {
+        try {
+            localStorage.setItem(key, value);
+        } catch {
+            // Ignore storage errors.
+        }
+    },
+
+    removeLocalStorageItem: function (key) {
+        try {
+            localStorage.removeItem(key);
+        } catch {
+            // Ignore storage errors.
+        }
+    },
+
     showLoading: function () {
         // Route transitions are handled by Blazor; avoid full-screen overlays
         // that block drawer interaction and make the app feel frozen.
@@ -326,14 +339,26 @@ window.taxbaikAdminSession = {
                 }
 
                 window.taxbaikAdminSession.traceUiState('admin-login', 'submit started');
-                const response = await fetch('/taxbaik/api/auth/login', {
+                const loginUrl = new URL('/taxbaik/api/auth/login', window.location.origin).toString();
+                const response = await fetch(loginUrl, {
                     method: 'POST',
                     headers: { 'Content-Type': 'application/json' },
                     body: JSON.stringify({ username, password })
                 });
 
                 if (!response.ok) {
-                    throw new Error('login failed');
+                    let errorDetail = '';
+                    try {
+                        errorDetail = await response.text();
+                    } catch {
+                        // ignore response body read errors
+                    }
+                    const suffix = errorDetail ? `: ${errorDetail}` : '';
+                    const error = new Error(`login failed (${response.status} ${response.statusText})${suffix}`);
+                    error.loginStatus = response.status;
+                    error.loginStatusText = response.statusText;
+                    error.loginResponse = errorDetail;
+                    throw error;
                 }
 
                 const data = await response.json();
@@ -374,7 +399,10 @@ window.taxbaikAdminSession = {
                         component: 'AdminLoginForm',
                         viewportWidth: window.taxbaikAdminSession.getViewportWidth(),
                         userAgent: navigator.userAgent || '',
-                        stack: error?.stack || ''
+                        stack: error?.stack || '',
+                        responseStatus: error?.loginStatus || '',
+                        responseStatusText: error?.loginStatusText || '',
+                        responseBody: (error?.loginResponse || '').slice(0, 500)
                     });
                 }
                 const errorMessage = document.createElement('div');