Restructure the updater page to mirror Backups exactly:
- updater-content.html: shared .sidebar/.category (with .category-icon SVGs)
outside the page card, .config-section + .page-header + a padded
.updater-page-body — fixes the missing content padding.
- updater.css: layout copied from .backup-* (flex, padding-bottom:48px,
body padding:22px); dropped the custom sidebar/header styles (now using the
shared chrome); kept the updater-specific content widgets.
- updater-page.js: delegate clicks on .updater-layout (sidebar is now a
sibling of the card) so clicking a sidebar entry opens that tab; fill the
shared page-header icon slot.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Signed-off-by: librelad <librelad@digitalangels.vip>
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