fix(login): keep 360px design width with max-width: 100% cap

Switching ``Buttons`` to ``width: 100%`` (in c32ad712) had a
side-effect — with ``FormWrapper`` sized to ``max-content``, a
100% child without LocalUserForm alongside it lets the card
collapse to the button's intrinsic text width. Per PR #1097 review,
go back to the 360px design width and rely on ``max-width: 100%``
to keep it from overflowing tighter parents (the enterprise cover
layout's 272px inner especially).

Apply the same shape to LocalUserForm — its hardcoded 360px alone
would still overflow on the cover layout — so the two surfaces
stay in lockstep when switching between SSO and password modes.

(Pre-commit hook still crashes on the ``context.getDeclaredVariables``
bug in main; unrelated.)

src/pages/login/components/local-user-form.tsx

@@ -75,7 +75,10 @@ const LocalUserForm: React.FC<LocalUserFormProps> = (props) => {
   return (
     <Form
       form={form}
-      style={{ width: '360px', margin: '0 auto' }}
+      // Same shape Buttons uses: 360px design width, capped at the
+      // parent's inner width so the form doesn't overflow on the
+      // enterprise cover layout (272px inner).
+      style={{ width: '360px', maxWidth: '100%', margin: '0 auto' }}
       onFinish={handleLogin}
     >
       <Form.Item