Align campus credential mock and settings UI

[Pigbibi]

Summary

• reset Android mock campus credential state during mock login
• align campus credential settings with status summary, quick auth switch, and danger section
• add smoke coverage for credential status/actions and relogin behavior

Verification

• ./gradlew --no-daemon --max-workers=1 -Dorg.gradle.jvmargs=-Xmx768m :app:testDebugUnitTest --tests cn.gdeiassistant.network.MockInterceptorSmokeTest

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Clear account field when login declines credential consent

In resetForLogin, the hasConsent == false branch sets hasSavedCredential = false but still stores campusAccount, and toPayload() always returns maskedCampusAccount from that value. This yields an inconsistent status payload (hasSavedCredential: false while account is still present), so the settings UI/API consumers can incorrectly treat a credential as still on file after a no-consent login. Align this branch with revoke/delete behavior by clearing the account when no credential is saved.

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