fix: Remove competing auth logic causing post-login redirect loops

- Disable automatic auth check on login page to prevent conflicts
- Use window.location.replace instead of href to prevent back button issues
- Simplify login flow to eliminate competing redirects
- Add console logging for better debugging of login flow

🤖 Generated with [Claude Code](https://claude.ai/code)

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

src/pages/login.astro

@@ -364,8 +364,10 @@ const csrfToken = generateCSRFToken();
         // Use the redirectTo from server or fallback to returnTo
         const finalRedirect = returnTo || result.redirectTo || '/dashboard';
         
-        // Use window.location.href for full page reload to ensure cookies are set
-        window.location.href = finalRedirect;
+        console.log('[LOGIN] Login successful, redirecting to:', finalRedirect);
+        
+        // Use window.location.replace to prevent back button issues
+        window.location.replace(finalRedirect);
       }
     } catch (error) {
       errorMessage.textContent = (error as Error).message;
@@ -475,9 +477,13 @@ const csrfToken = generateCSRFToken();
     }
   }
 
+  // Skip auth check on login page - let the form handle login flow
   // Initial auth check with delay to prevent flashing
-  setTimeout(() => {
-    checkAuthState();
-  }, 100);
+  // setTimeout(() => {
+  //   checkAuthState();
+  // }, 100);
+  
+  // Just hide loading and show form immediately on login page
+  hideLoading();
 
 </script>