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* fix(panel): accept 2FA codes from adjacent TOTP windows CheckUser compared only gotp.Now(), so a code submitted at the end of its 30s window (or with slight client/server clock drift) failed with 'invalid 2fa code', while the immediate retry in the next window succeeded. Accept current +/-1 window, the standard TOTP skew tolerance. Fixes MHSanaei/3x-ui#6535 * fix(panel): share TOTP skew tolerance with VerifyTwoFactorCode Move the +/-1 window helper to internal/util/totp so both 2FA acceptance points use it: login (CheckUser) and disable/rebind plus username/password changes (VerifyTwoFactorCode). Also shrink comments to the 2-line house rule and anchor the unit test mid-window to avoid a step-boundary flake. Addresses review on #6546 (MEDIUM + 2 LOWs). --------- Co-authored-by: sdhfsl <sdhfsl@users.noreply.github.com>