Shivam Mishra 875ea6e88f fix(auth): persist MFA sessions across browser restarts (#15379)
MFA-authenticated users now remain signed in across browser restarts,
matching the session lifetime of password-authenticated users.

## Closes

-
[CW-7898](https://linear.app/chatwoot/issue/CW-7898/mfa-users-are-logged-out-when-the-browser-session-ends)

## How to reproduce

1. Enable MFA for a user.
2. Sign in and complete OTP or backup-code verification.
3. End the browser session, then reopen the browser and return to
Chatwoot.
4. Before this change, the user is sent back to the login page.

## Root cause and evidence

Before this change, successful MFA verification wrote
`cw_d_session_info` directly through `document.cookie` without an
`Expires` or `Max-Age` attribute. This makes it a session cookie:

- [MFA cookie creation on the base
commit](a4eae9710a/app/javascript/dashboard/components/auth/MfaVerification.vue (L70-L87))
- [MDN session-cookie
behavior](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Set-Cookie)
- [Chromium cookie persistence
documentation](https://chromium.googlesource.com/chromium/src/+/master/net/cookies/README.md)

Password login already uses `setAuthCredentials`, which derives a
persistent cookie expiry from the authentication response:

- [Existing credential
helper](a4eae9710a/app/javascript/dashboard/store/utils/api.js (L28-L36))
- [Configured two-month token
lifetime](a4eae9710a/config/initializers/devise_token_auth.rb (L8-L10))

This change routes successful MFA verification through the same
credential helper and existing verified event. The regression test
asserts that MFA credentials use this shared persistence path.

Session-cookie restoration is browser and profile dependent. Chromium
may persist session cookies when restoring a previous browsing session,
so the problem can be masked on some restarts. This PR does not rely on
a desktop-versus-mobile distinction.

## How to verify

1. On `develop`, complete an MFA login.
2. Inspect `cw_d_session_info` in browser developer tools. Its expiry is
shown as `Session`.
3. Repeat on this branch.
4. Confirm that `cw_d_session_info` has a concrete expiry derived from
the authentication response instead of `Session`.
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