fix(tuxedo): graceful hero video fallback + storefront polish

Hero video at /videos/tuxedo-hero.mp4 was hardcoded and 404ing, leaving
the page with no background.

* Add brand_settings.hero_video_url (migration 0099) so each brand
  can point its hero at any reachable mp4/webm without code changes.
  Saves via a separate UPDATE so the existing 32-param
  upsert_brand_settings RPC signature stays untouched.
* TuxedoVideoHero now accepts videoUrl + posterUrl. Poster renders
  underneath the <video> element via next/image so the hero is
  complete even without a video. <video> flips a data-failed attribute
  on error/stall so the poster takes over without DOM churn.
  Ambient float animations slowed 950ms → 7s/8s.
* Why section: dropped emerald/amber kaleidoscope, unified accent.
  Footer is now a provenance strip (Family-Grown · 5,360 ft · Est 1982).
* Story section: removed giant decorative 'SINCE' parallax text and
  the duplicate stats counter (already in hero). Replaced with a
  1982/2003/Today timeline.

db/migrations/0099_brand_hero_video.sql

@@ -0,0 +1,19 @@
+-- 0099_brand_hero_video.sql
+-- Add an optional hero_video_url column to brand_settings so each brand can
+-- point its storefront hero at any video URL (CDN, signed S3, Supabase
+-- storage, etc.) without a code change. When unset or unplayable, the
+-- storefront hero falls back to hero_image_url.
+--
+-- We intentionally avoid touching the `upsert_brand_settings(...)`
+-- SECURITY DEFINER RPC here — its 32-parameter positional signature is
+-- already deployed in production. New value writes use a separate
+-- idempotent statement.
+
+ALTER TABLE brand_settings
+  ADD COLUMN IF NOT EXISTS hero_video_url TEXT;
+
+COMMENT ON COLUMN brand_settings.hero_video_url IS
+  'Optional. Direct URL to a hero background video (mp4/webm). When null or 4xx/5xx, storefront falls back to hero_image_url as a still poster.';
+
+-- Make sure new column is visible to consumers that read brand_settings.
+GRANT SELECT ON brand_settings TO anon, authenticated;