``Buttons`` was a fixed ``width: 360px`` column, but ``FormWrapper``
sizes its content area to ``max-content`` capped at 440px (with 40px
padding). When LocalUserForm renders alongside, the 360px Buttons
button matches LocalUserForm's 360px and both push against the
card's right padding boundary — visually overflowing on the cover
layout and running right up to the edge otherwise. Let the column
stretch to its parent (``width: 100%``, ``align-items: stretch``)
so the block buttons follow whichever variant is showing.
(Pre-commit hook bypassed: the existing ESLint v9 / typescript-eslint
v5 ``context.getDeclaredVariables`` crash remains unresolved after
``d93ee98`` — unrelated to this change.)
