refactor(erp-auth): implement precise login result detection with three outcomes

- Add waitForLoginResult() method using Promise.race to detect:
  - Success: .nc-workbench-icon element visible
  - Failure: '名称或密码错误' error text visible
  - Force login: click confirm button and re-detect
- Extract timeout constants (PAGE_LOAD_TIMEOUT, LOGIN_RESULT_TIMEOUT, FORCE_LOGIN_TIMEOUT)
- Improve error handling with clear error messages
- Add unit tests for class structure verification
- Fix test setup for Electron app mock

Fixes: ERP login success/failure detection was ambiguous

package-lock.json

@@ -41,6 +41,7 @@
         "@vitejs/plugin-react": "^5.1.1",
         "@vitest/coverage-v8": "^4.0.18",
         "autoprefixer": "^10.4.27",
+        "dotenv": "^17.3.1",
         "electron": "^39.2.6",
         "electron-builder": "^26.0.12",
         "electron-vite": "^5.0.0",
@@ -5591,6 +5592,19 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/dotenv": {
+      "version": "17.3.1",
+      "resolved": "https://registry.npmjs.org/dotenv/-/dotenv-17.3.1.tgz",
+      "integrity": "sha512-IO8C/dzEb6O3F9/twg6ZLXz164a2fhTnEWb95H23Dm4OuN+92NmEAlTrupP9VW6Jm3sO26tQlqyvyi4CsnY9GA==",
+      "dev": true,
+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://dotenvx.com"
+      }
+    },
     "node_modules/dotenv-expand": {
       "version": "11.0.7",
       "resolved": "https://registry.npmjs.org/dotenv-expand/-/dotenv-expand-11.0.7.tgz",