fix: quote freight on its own, and drop the Calcular button

Going back to home delivery with a CEP already typed, or restoring a saved
cart, now quotes the freight again by itself; before, only pressing Calcular
did. With every case covered, the button is gone.

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

web/cart.js

@@ -32,13 +32,14 @@
       if(saved && !pedido.length && !itemAtual){
         pedido=saved.items;cliente=saved.customer;entrega=saved.delivery;
         // Freight must be quoted again; restored browser values are never final.
-        if(entrega.tipo==='frete'){entrega.cotado=false;entrega.valor=0;}
+        if(entrega.tipo==='frete'){entrega.cotado=false;entrega.valor=0;entrega.dias=null;}
         for(const [id,key] of [['fCnpj','cnpj'],['fZap','zap'],['fMail','mail']])$(id).value=cliente[key];
         $('cepIn').value=fmtCep(entrega.cep);
         entrega.end=entrega.end||{};
         for(const [id,key] of [['eNome','nome'],['eRua','rua'],['eNum','num'],['eComp','comp'],
                                ['eBairro','bairro'],['eCidade','cidade'],['eUf','uf']])$(id).value=entrega.end[key]||'';
         $('atual').style.display='none';pintaEntrega();
+        if(entrega.tipo==='frete' && entrega.cep.length===8 && window.dtfFreight) window.dtfFreight();
         notice.textContent='Carrinho recuperado. Remova e adicione novamente um item se precisar alterar sua montagem.';
       }else{
         const account=await window.dtfApi('/account/me');