upgrade: adopt V8.31.1 (theme 1.3/1.4 redesigns, editor deep-canvas, guided launch, component library)

Overlay 190 upstream items (V8.22→8.31) preserving trade-pro theme,
registry tests, and design docs. Re-applied full patch set on identical
anchors (discovery/env_for/blocks.css/type-mapping/locale-override/
theme_color/frontend entries/test_theme_pro_v3 mods) plus compose pins.

Verified: theme suites 35/35; dual-baseline full run 415 passed vs
pristine 386+29 ours, FAILED-set diff EMPTY (same 10 Windows env fails).
Live: container 8.31.1-dev.1 healthy, hesupipe 192 entries intact,
trade-pro build 203 pages 0 errors.

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

app/static/pro.js

@@ -65,6 +65,10 @@
    const q=panel.querySelector('[data-pro-filter-search]'),b=panel.querySelector('[data-pro-filter-brand]'),c=panel.querySelector('[data-pro-filter-category]'),count=panel.querySelector('[data-pro-filter-count]');
    function options(sel,key){const vals=[...new Set(cards.map(x=>x.dataset[key]||'').filter(Boolean))].sort();vals.forEach(x=>sel.add(new Option(x,x)));if(!vals.length)sel.closest('label').hidden=true;}
    options(b,'brand');options(c,'category');
+   // Support shareable searches from automotive homepage without changing page URLs.
+   const params=new URLSearchParams(window.location.search);
+   if(q && params.has('q')) q.value=(params.get('q')||'').slice(0,120);
+   if(b && params.has('brand') && [...b.options].some(o=>o.value===params.get('brand'))) b.value=params.get('brand');
    function run(){const str=q.value.trim().toLocaleLowerCase();let visible=0;
      cards.forEach(el=>{const hit=el.textContent.toLocaleLowerCase().includes(str)&&(!b.value||el.dataset.brand===b.value)&&(!c.value||el.dataset.category===c.value);el.hidden=!hit;visible+=Number(hit);});count.textContent=`共 ${visible} 条`;blank.hidden=visible!==0;}
    [q,b,c].forEach(x=>x.addEventListener(x===q?'input':'change',run));run();