feat: give each Site product and the cart its own page

The home, each product's Montagem and the cart now have their own
addresses (/artes-avulsas, /arquivo-por-metro, /uv-artes-avulsas,
/uv-arquivo-por-metro, /carrinho) and show only their own content, with
Back, Forward, reload and direct links working as in any store. They stay
one document so uploaded artworks survive moving between pages; nginx
serves index.html for these addresses.

"Adicionar ao carrinho" puts the item in the cart and opens it, and an
empty cart says so. Portal quote links open in the cart. Also fixes the
"57 cm" line break on the ready-sheet option, returns "Novo pedido" to
the home, and says PDF depends on the product.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/browser_test.mjs

@@ -63,6 +63,10 @@ try{
   await site.call('Page.reload');
   await waitFor(()=>site.eval('typeof window.dtfCheckout === "function"'),'reload after security probe');
   await site.click('[data-modo="file"]');
+  // Each product has its own page; the home's parts are not on it.
+  assert.deepEqual(await site.eval(`({path:location.pathname,page:document.documentElement.dataset.rota,
+    cards:getComputedStyle($('cards')).display,cart:getComputedStyle($('carr')).display})`),
+    {path:'/arquivo-por-metro',page:'produto',cards:'none',cart:'none'});
   await site.click('[data-cam="tabela"]');
   const root=await site.call('DOM.getDocument');
   const input=await site.call('DOM.querySelector',{nodeId:root.root.nodeId,selector:'#inp'});
@@ -77,6 +81,10 @@ try{
   await pause(800);
   await site.call('Page.reload');
   await waitFor(()=>site.eval('typeof pedido!=="undefined" && pedido.length===1'),'persistent cart recovery');
+  // Reloading a product page reopens that product; the cart is its own page.
+  assert.equal(await site.eval('modo'),'file');
+  await site.click('#cartLink');
+  await waitFor(()=>site.eval(`location.pathname==='/carrinho' && getComputedStyle($('carr')).display!=='none' && getComputedStyle($('foco')).display==='none'`),'cart page');
   assert.equal(await site.eval('pedido[0].localFiles[0].name'),'local-test.cdr');
   assert.equal(await site.eval('pedido[0].total'),21.89);
   assert.equal(await site.eval('document.getElementById("bPagar").disabled'),false);

tests/security_test.py

@@ -29,6 +29,10 @@ def run():
     assert script_src == "script-src 'self'", script_src
     assert "object-src 'none'" in policy
     assert 'cdnjs' not in policy, 'pdf.js is vendored; no CDN belongs in the policy'
+    # Product pages and the cart are addresses of the Site's page, under the same policy.
+    for page in ('/arquivo-por-metro','/artes-avulsas','/uv-arquivo-por-metro','/uv-artes-avulsas','/carrinho'):
+        assert raw(page,200)['Content-Security-Policy']==policy,page
+    raw('/carrinho/outra-coisa',404)
     raw('/api/health',400,{'Host':'attacker.invalid'})
     raw('/api/account/logout',403,{'Content-Type':'application/json','Origin':'https://attacker.invalid'},b'{}')
     raw('/api/account/logout',403,{'Content-Type':'application/json','Origin':'http://localhost:9999'},b'{}')