Fix fila column label and add error handling to campaign action buttons

Relabel misleading "Empresa" header to "Lead ID" in fila table (queue
has no join to leads, cell showed lead_id). Wrap iniciar/pausar/retomar
and aprovar/cancelar selecionados handlers in try/catch with toast on
failure, matching btn-gerar-fila's existing pattern.

public/index.html

@@ -268,7 +268,7 @@
         <button class="btn-ghost btn-sm" id="btn-cancelar-selecionados" type="button">Cancelar selecionados</button>
       </div>
       <table>
-        <thead><tr><th></th><th>Empresa</th><th>Numero</th><th>Mensagem</th><th>Status</th></tr></thead>
+        <thead><tr><th></th><th>Lead ID</th><th>Numero</th><th>Mensagem</th><th>Status</th></tr></thead>
         <tbody id="fila-tabela"></tbody>
       </table>
     </div>