* fix: prevent long strings from overflowing public layout
* fix: fall back to default hero copy and tighten hero line-height
* fix: skip blank testimonials and guard empty portfolio metadata
* feat: add branded 419, 429 and 503 error pages
* fix: reset submit state on bfcache restore, swap label while sending, trap mobile menu focus
* chore: track hardening task status
* fix: restore contact submit state after bfcache
* fix: allow contact links to wrap long unbroken strings
