admin/ocr index: heading, sender-models heading, global-history link,
defensive defaults for missing trainingInfo fields.
admin/ocr/[personId]: person name from personNames lookup, Unknown
fallback when not found, back-link href, missing-personNames defensive
handling.
8 tests across two pages.
Refs #496.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
