feat[design]: improve BBBank Theme

[MartaPintoTeixeira]

Description

This task is part of: feat[design]: implement BBBank Theme
https://github.com/solid-design-system/internal/issues/113

Support implementation and handle quick fixes.

Open Questions towards development

• Question1
• Question2

DoR

• Item has been estimated by the team
• Item dependencies have been identified and documented

DoD

• Brand approval (if neccessary)
• Figma documentation file incl. hand-off has been created/updated (if applicable)
• Tokens have been applied/updated (if applicable)
• Crosslinks are created/updated
• Implementation works successfully on figma branch