fix: exibir a nova senha SIP ao redefinir senha de ramal

O endpoint POST /extensions/:id/reset-password já retornava a senha em
texto puro (mesmo padrão da criação), mas o frontend descartava o
resultado e só mostrava um toast genérico — o usuário nunca via a senha
nova, precisando adivinhar ou reconfigurar de novo. Reaproveita o mesmo
padrão de diálogo 'copie agora' já usado na criação do ramal.

apps/frontend/src/app/(app)/ramais/page.tsx

@@ -152,6 +152,42 @@ function ExtensionFormDialog({
   );
 }
 
+function ResetPasswordDialog({
+  result,
+  onOpenChange,
+}: {
+  result: { number: string; password: string } | null;
+  onOpenChange: (v: boolean) => void;
+}) {
+  return (
+    <Dialog open={result !== null} onOpenChange={onOpenChange}>
+      <DialogContent>
+        <DialogHeader>
+          <DialogTitle>Senha SIP redefinida — ramal {result?.number}</DialogTitle>
+        </DialogHeader>
+        <div className="flex flex-col gap-3">
+          <p className="text-sm text-muted-foreground">
+            Exibida apenas uma vez, copie agora:
+          </p>
+          <div className="flex items-center gap-2 rounded-md border border-border bg-muted p-2 font-mono text-sm">
+            <span className="flex-1 break-all">{result?.password}</span>
+            <Button
+              size="icon"
+              variant="ghost"
+              onClick={() => result && navigator.clipboard.writeText(result.password)}
+            >
+              <Copy className="size-4" />
+            </Button>
+          </div>
+        </div>
+        <DialogFooter>
+          <Button onClick={() => onOpenChange(false)}>Fechar</Button>
+        </DialogFooter>
+      </DialogContent>
+    </Dialog>
+  );
+}
+
 function ExtensionsContent() {
   const { can } = useAuth();
   const { toast } = useToast();
@@ -160,6 +196,9 @@ function ExtensionsContent() {
   const debouncedSearch = useDebounce(search);
   const [dialogOpen, setDialogOpen] = React.useState(false);
   const [editing, setEditing] = React.useState<Extension | null>(null);
+  const [resetResult, setResetResult] = React.useState<{ number: string; password: string } | null>(
+    null,
+  );
 
   const { data, isLoading, isError, refetch } = useQuery({
     queryKey: ['extensions'],
@@ -168,9 +207,9 @@ function ExtensionsContent() {
 
   const resetPassword = useMutation({
     mutationFn: (id: string) => extensionsService.resetPassword(id),
-    onSuccess: () => {
+    onSuccess: (result) => {
       queryClient.invalidateQueries({ queryKey: ['extensions'] });
-      toast({ title: 'Senha SIP redefinida', variant: 'success' });
+      setResetResult({ number: result.number, password: result.sipPassword });
     },
     onError: (err) => toast({ title: 'Erro', description: errorMessage(err), variant: 'destructive' }),
   });
@@ -283,6 +322,10 @@ function ExtensionsContent() {
         emptyMessage="Nenhum ramal cadastrado."
       />
       <ExtensionFormDialog open={dialogOpen} onOpenChange={setDialogOpen} extension={editing} />
+      <ResetPasswordDialog
+        result={resetResult}
+        onOpenChange={(v) => !v && setResetResult(null)}
+      />
     </>
   );
 }