feat: trust_bar + applications_band blocks; homepage now block-driven

- blueprints: register trust_bar (icon/title/text items) and applications_band
  (2x2 dark-band tiles) block types; render with escaped items, ordinal icon
  fallback, 8-item cap; auto-exposed in editor via /api/editor/blocks and
  grouped under business in the studio palette
- blocks.css: platform base layer for both blocks (app/static + trade-pro
  Layer A kept verbatim in sync) + trade-pro bridge vocabulary (icon-circle,
  hairline dividers, navy->brand gradient band, glass tiles, 900/620
  breakpoints, reduced-motion) without touching canvas hooks
- tests: test_trade_pro_home_block_driven covers the full studio-draft
  PUT -> publish -> build chain; 8 block types on the homepage, template
  markers absent under layout_mode=replace, clean build report
- scripts/setup_home_blocks.py: production write path for site 483295c29ea0
  (login -> draft -> publish -> build -> verify); real catalogue counts feed
  the stats block; run after the Docker image picks up the new block types

Co-Authored-By: Claude Code <noreply@anthropic.com>

app/static/studio-experience-v829.js

@@ -5,7 +5,7 @@
   const pages=new Set(['home','listing','product','article','about','contact']);
   const categories={
     visual:new Set(['hero','banner','carousel','gallery','image','image_text','image-grid','video','slider']),
-    business:new Set(['collection','products','product_list','brand_wall','brands','features','stats','testimonials','faq','contact','form','cta','map']),
+    business:new Set(['collection','products','product_list','brand_wall','brands','features','stats','testimonials','faq','contact','form','cta','map','trust_bar','applications_band']),
     advanced:new Set(['layout','columns','tabs','accordion','html-embed','embed','spacer','divider'])
   };
   function categoryOf(key){for(const [name,ids] of Object.entries(categories))if(ids.has(key))return name;return 'basic'}