Match rover grid toggle to main map's checkbox style

lib/microwaveprop_web/live/rover_live.ex

@@ -260,14 +260,15 @@ defmodule MicrowavepropWeb.RoverLive do
               <option value={value} selected={value == to_string(@band)}>{label}</option>
             <% end %>
           </select>
-          <button
-            type="button"
-            phx-click="toggle_grids"
-            class={["btn btn-sm btn-square", if(@show_grids, do: "btn-primary", else: "btn-ghost")]}
-            title="Toggle grid overlay"
-          >
-            <.icon name="hero-squares-2x2" class="size-4" />
-          </button>
+          <label class="flex items-center gap-2 cursor-pointer">
+            <input
+              type="checkbox"
+              class="toggle toggle-sm toggle-primary"
+              checked={@show_grids}
+              phx-click="toggle_grids"
+            />
+            <span class="text-sm">Grid squares</span>
+          </label>
         </div>
 
         <form phx-submit="add_station" class="flex gap-1">