fix(login): text overflow on login page

[MyvTsv]

• I have performed a self-review of my code.
• I have added tests (when available) that prove my fix is effective or that my feature works.
• I have updated the CHANGELOG with a short functional description of the fix or new feature.
• This change requires a documentation update.

Description

• It fixes !40676

Fixes the issue where alert text overflows outside the card boundaries on the login page when the screen width is >= 1200px.

Bootstrap's col-* classes (e.g., col-xxl-4, col-xl-6) calculate dimensions as percentages of the parent container width. On the login page, the parent container (col-auto) has no defined width, causing percentage-based column classes to fail and breaking the alert layout.

Use col-12 (100% width) for alerts displayed on the login page. Since 100% of any width equals the full available space, this works reliably in all contexts. For other pages (central, helpdesk), alerts continue to use their configured size classes.

Screenshots (if appropriate):

[Rom1-B]

I saw the alert above the login and not after.
Can you have the customer test it and see if they comment on the position?