feat: the upload bar says how long is left, not a notice before it

The product page's notice about the upload time is gone. The cart's upload
bar now reads "Enviando seus arquivos · faltam cerca de 6 min", measured
from the upload's own speed (a range from the size for the first seconds),
with a line saying the time depends on the internet and to keep the page
open. The header and the pay button show the same time instead of a
percentage.

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

web/site-modes.js

@@ -11,7 +11,6 @@ function escolheProduto(m){
 }
 function abrir(m){
   modo=m; artes=[]; folhas=[]; metros=0; nota=0; reencaixado=false;
-  pintaAvisoEnvio();
   montagemCm=0;
   avisoTipo('');
   pintaModo();
@@ -90,7 +89,6 @@ document.querySelectorAll('#tipoEnvio .cam').forEach(b=>b.addEventListener('clic
 function trocaTipo(destino){
   if(!destino || modo===destino) return;
   folhas=[]; artes=[]; recemChegada=null; metros=0; nota=0; montagemCm=0;
-  pintaAvisoEnvio();
   modo=destino;
   history.replaceState(history.state,'',PAGINAS[modo]); document.title=tituloPagina();
   $('lista').innerHTML=''; $('rA').style.display='none'; recusa([]);