fix(hub): the Node page takes the width of a settings page

`.node-page` carried `max-width: 700px` of its own while Settings, Profile
and the create-group wizard take `.main`'s. The audit tab is a six-column
table — timestamp, event, user, IP, group, detail — with every fixed-shape
column set `white-space: nowrap` so an IP is never clipped, so at 700px it
scrolled sideways inside `.node-table-scroll` with a couple of hundred pixels
of `.main` empty beside it. Measured at 1024: 596px of table box where the
page had 856px to give.

The rule goes; the class stays as the anchor for the assertions.
`.node-group` and `.settings-section` are already the same rule twice over
(same background, border, radius, padding), so the two pages now line up card
for card.

test_node_page_width_measured.py: the Node page and a Settings page are the
same width at every width from 320 up, their cards the same rectangle, the
audit table no longer wider than its scroller at 1024, and — the narrow case
being the design rather than a regression — the table still scrolling inside
its own box on a phone without pushing the document sideways.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014UtzVrzM7e2tG9fSpkR9ML

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