SecuNav.renderTabs() now automatically initializes theme and loads CSS,
eliminating boilerplate from views. Added renderCompactTabs() for nested
modules and renderBreadcrumb() for back-navigation.
Updated module navs: cdn-cache, client-guardian, crowdsec-dashboard,
media-flow, mqtt-bridge, system-hub. Removed ~1000 lines of duplicate CSS.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
