Replace 895-line monolith with 5 focused tab components (Profile,
Appearance, Social, Security, Integrations) mirroring AdminPortal's
tab pattern. URL deep linking via ?tab= search param. Conditional
rendering prevents unmounted tabs from firing API calls.
Reviewed by senior-code-reviewer, senior-ui-designer, and
security-penetration-tester agents — all findings actioned.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
