Remove 'Check Now' button and clean up equipment detail page

Removed the manual 'Check Now' functionality since polling happens
automatically on a schedule with distributed coordination. Manual
triggers would interfere with the coordinated polling system.

Changes:
- Removed 'Check Now' button from equipment detail page
- Removed trigger_check event handler
- Simplified Discover and Edit buttons to use standard button styling
- Removed custom classes in favor of default button component styling

The equipment is now polled automatically based on its configured
check_interval_seconds, coordinated across all pods.

lib/towerops_web/live/equipment_live/show.ex

@@ -40,12 +40,6 @@ defmodule ToweropsWeb.EquipmentLive.Show do
      |> put_flash(:info, "Discovery completed")}
   end
 
-  @impl true
-  def handle_event("trigger_check", _params, socket) do
-    _ = Towerops.Monitoring.EquipmentMonitor.trigger_check(socket.assigns.equipment.id)
-    {:noreply, put_flash(socket, :info, "Check triggered")}
-  end
-
   @impl true
   def handle_event("trigger_discovery", _params, socket) do
     equipment = socket.assigns.equipment

lib/towerops_web/live/equipment_live/show.html.heex

@@ -9,24 +9,12 @@
       <p class="text-sm text-zinc-600 dark:text-zinc-400 font-mono">{@equipment.ip_address}</p>
     </div>
     <div class="flex gap-2">
-      <.button
-        phx-click="trigger_check"
-        class="text-sm bg-white dark:bg-zinc-800 border border-zinc-300 dark:border-zinc-700 text-zinc-900 dark:text-zinc-100"
-      >
-        <.icon name="hero-arrow-path" class="h-4 w-4" /> Check Now
-      </.button>
       <%= if @equipment.snmp_enabled do %>
-        <.button
-          phx-click="trigger_discovery"
-          class="text-sm bg-white dark:bg-zinc-800 border border-zinc-300 dark:border-zinc-700 text-zinc-900 dark:text-zinc-100"
-        >
+        <.button phx-click="trigger_discovery">
           <.icon name="hero-magnifying-glass" class="h-4 w-4" /> Discover
         </.button>
       <% end %>
-      <.button
-        navigate={~p"/orgs/#{@current_organization.slug}/equipment/#{@equipment.id}/edit"}
-        class="text-sm bg-white dark:bg-zinc-800 border border-zinc-300 dark:border-zinc-700 text-zinc-900 dark:text-zinc-100"
-      >
+      <.button navigate={~p"/orgs/#{@current_organization.slug}/equipment/#{@equipment.id}/edit"}>
         <.icon name="hero-pencil" class="h-4 w-4" /> Edit
       </.button>
     </div>