The wizard nav buttons used class="btn-primary" / "btn-secondary"
without the .btn base class, so the padding (10px 20px),
border-radius (8px), font-size, and inline-flex centering rules from
.btn never applied. Buttons rendered as ~18px-tall colored boxes with
no padding (visible mismatch against the sibling Cancel <a> which
correctly used class="btn btn-secondary").
Added .btn to all three buttons (#next-btn, #back-btn, #finish-btn).
No CSS change — purely a markup fix.
Playwright before: next.padding="0px" borderRadius="0px" height=18
Playwright after: next.padding="10px 20px" borderRadius="8px" height=38
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