feat: the panel's own confirm and prompt dialogs everywhere; the assistant's field is one line with a square send button

internal/server/web/templates/forwards.html

@@ -49,7 +49,7 @@
           <td class="lead">{{.Label}}</td>
           <td class="actions" style="text-align:right">
             <form method="post" action="/forwards/{{.ID}}/delete" style="display:inline"
-                  onsubmit="return confirm('Удалить правило?')">
+                  data-confirm="Удалить правило?" data-danger>
               <input type="hidden" name="csrf" value="{{$.CSRF}}">
               <button class="btn danger small" type="submit">Удалить</button>
             </form>