A backdrop for the achievement

Creator Journey previews get their own badge and gradient, with the profile still up front.

• The achievement badge sits on the right, with its colours fading into dark blue on the left.
• A faint Grembed mark sits behind the profile. The portrait, creator name and achievement details keep their space.
• The preview page uses the same backdrop, whether the creator has a banner or not.
• The artwork stays sharp after a cleanup pass, and smaller previews retain the creator’s portrait.