Fix admin login verification loop

- Remove checkSession from useEffect dependency array to prevent infinite loop
- Improve session validation logic with better error handling
- Add clear session functionality for debugging
- Add 'Clear Session & Reload' button to help with stuck sessions
- Better session cleanup on validation errors

This should resolve the verification loop issue in the admin login.

app/manage/page.tsx

@@ -97,42 +97,61 @@ const AdminPage = () => {
     const sessionToken = sessionStorage.getItem('admin_session_token');
     const csrfToken = authState.csrfToken;
 
-    if (authStatus === 'true' && sessionToken && csrfToken) {
-      try {
-        const response = await fetch('/api/auth/validate', {
-          method: 'POST',
-          headers: {
-            'Content-Type': 'application/json',
-            'X-CSRF-Token': csrfToken
-          },
-          body: JSON.stringify({
-            sessionToken,
-            csrfToken
-          })
-        });
-
-        if (response.ok) {
-          setAuthState(prev => ({
-            ...prev,
-            isAuthenticated: true,
-            isLoading: false,
-            showLogin: false
-          }));
-          return;
-        } else {
-          sessionStorage.clear();
-        }
-      } catch {
-        sessionStorage.clear();
-      }
+    // If no session data, show login immediately
+    if (!authStatus || !sessionToken || !csrfToken) {
+      setAuthState(prev => ({
+        ...prev,
+        isAuthenticated: false,
+        isLoading: false,
+        showLogin: true
+      }));
+      return;
     }
 
-    setAuthState(prev => ({
-      ...prev,
-      isAuthenticated: false,
-      isLoading: false,
-      showLogin: true
-    }));
+    try {
+      const response = await fetch('/api/auth/validate', {
+        method: 'POST',
+        headers: {
+          'Content-Type': 'application/json',
+          'X-CSRF-Token': csrfToken
+        },
+        body: JSON.stringify({
+          sessionToken,
+          csrfToken
+        })
+      });
+
+      if (response.ok) {
+        setAuthState(prev => ({
+          ...prev,
+          isAuthenticated: true,
+          isLoading: false,
+          showLogin: false
+        }));
+        return;
+      } else {
+        // Clear invalid session
+        sessionStorage.removeItem('admin_authenticated');
+        sessionStorage.removeItem('admin_session_token');
+        setAuthState(prev => ({
+          ...prev,
+          isAuthenticated: false,
+          isLoading: false,
+          showLogin: true
+        }));
+      }
+    } catch (error) {
+      console.error('Session validation error:', error);
+      // Clear session on error
+      sessionStorage.removeItem('admin_authenticated');
+      sessionStorage.removeItem('admin_session_token');
+      setAuthState(prev => ({
+        ...prev,
+        isAuthenticated: false,
+        isLoading: false,
+        showLogin: true
+      }));
+    }
   }, [authState.csrfToken]);
 
   // Initialize
@@ -153,7 +172,20 @@ const AdminPage = () => {
     if (authState.csrfToken && !authState.isLocked) {
       checkSession();
     }
-  }, [authState.csrfToken, authState.isLocked, checkSession]);
+  }, [authState.csrfToken, authState.isLocked]);
+
+  // Handle logout
+  const handleLogout = useCallback(() => {
+    sessionStorage.removeItem('admin_authenticated');
+    sessionStorage.removeItem('admin_session_token');
+    setAuthState(prev => ({
+      ...prev,
+      isAuthenticated: false,
+      showLogin: true,
+      password: '',
+      error: ''
+    }));
+  }, []);
 
   // Handle login form submission
   const handleLogin = async (e: React.FormEvent) => {
@@ -440,6 +472,17 @@ const AdminPage = () => {
                 )}
               </button>
             </form>
+
+            {/* Debug: Clear Session Button */}
+            <div className="mt-6 pt-6 border-t border-white/20">
+              <button
+                type="button"
+                onClick={handleLogout}
+                className="w-full text-white/60 hover:text-white/80 text-sm py-2 px-4 rounded-lg border border-white/20 hover:border-white/40 transition-all"
+              >
+                Clear Session & Reload
+              </button>
+            </div>
           </motion.div>
         </div>
       </div>