fix: implement granular session health detection with SteamAuthError and smart conditional replacement logic

frontend/electron/main.ts

@@ -7,7 +7,7 @@ import axios from 'axios';
 import fs from 'fs';
 import { pathToFileURL } from 'url';
 import { fetchProfileData, scrapeBanStatus } from './services/steam-web';
-import { scrapeCooldown } from './services/scraper';
+import { scrapeCooldown, SteamAuthError } from './services/scraper';
 import { steamClient, LocalSteamAccount } from './services/steam-client';
 import { BackendService } from './services/backend';
 
@@ -247,7 +247,12 @@ const scrapeAccountData = async (account: Account) => {
           if (backend) await backend.pushCooldown(account.steamId, undefined, now.toISOString());
         }
       } catch (e: any) {
-        if (e.message.includes('cookie') || e.message.includes('Sign In')) account.authError = true;
+        if (e instanceof SteamAuthError) {
+          account.authError = true;
+        } else {
+          console.error(`[Scraper] Temporary error for ${account.personaName}: ${e.message}`);
+        }
+      }
       }
     }
     if (backend && !account._id.startsWith('shared_')) {