Add dashboard setup checklist + onboarding progress

- Setup Progress bar on dashboard when devices exist but setup incomplete
- Tracks: devices added, billing connected, alert routing configured,
  on-call schedule created
- Each step links to the relevant setup page
- Dismissible with X button
- Progress bar shows visual completion percentage
- Optional steps labeled (billing, on-call)

lib/towerops_web/live/dashboard_live.ex

@@ -150,10 +150,35 @@ defmodule ToweropsWeb.DashboardLive do
     |> assign(:uptime_percentage, uptime_percentage)
     |> assign(:recent_activity, recent_activity)
     |> assign(:favicon_status, favicon_status(Map.get(status_counts, :down, 0), length(active_alerts)))
+    |> assign(:setup_checklist, build_setup_checklist(organization, device_count))
     |> load_insights(organization_id)
     |> load_recent_config_changes(organization_id)
   end
 
+  defp build_setup_checklist(organization, device_count) do
+    integrations = Towerops.Integrations.list_integrations(organization.id)
+    has_billing = Enum.any?(integrations, fn i -> i.provider in ~w(gaiia sonar splynx visp) and i.enabled end)
+    has_alert_routing = organization.alert_routing != "builtin" or has_escalation_policy?(organization)
+    schedules = Towerops.OnCall.list_schedules(organization.id)
+
+    steps = [
+      %{key: :devices, label: "Add devices to monitor", done: device_count > 0, link: ~p"/devices/new"},
+      %{key: :billing, label: "Connect billing platform", done: has_billing, link: ~p"/orgs/#{organization.slug}/settings?tab=integrations", optional: true},
+      %{key: :alerting, label: "Configure alert routing", done: has_alert_routing, link: ~p"/orgs/#{organization.slug}/settings?tab=general", optional: false},
+      %{key: :oncall, label: "Create on-call schedule", done: length(schedules) > 0, link: ~p"/schedules/new", optional: true}
+    ]
+
+    completed = Enum.count(steps, & &1.done)
+    %{steps: steps, completed: completed, total: length(steps), all_done: completed == length(steps)}
+  end
+
+  defp has_escalation_policy?(organization) do
+    case Towerops.OnCall.list_escalation_policies(organization.id) do
+      [] -> false
+      _ -> true
+    end
+  end
+
   defp load_recent_config_changes(socket, organization_id) do
     alias Towerops.ConfigChanges
 

lib/towerops_web/live/dashboard_live.html.heex

@@ -108,6 +108,64 @@
     </div>
   <% end %>
 
+  <%!-- Setup Checklist — shown when devices exist but setup isn't complete --%>
+  <%= if assigns[:setup_checklist] && !@setup_checklist.all_done && @device_count > 0 do %>
+    <div id="setup-checklist" class="mt-4 rounded-lg border border-blue-200 bg-blue-50/50 dark:border-blue-800/50 dark:bg-blue-900/10 p-4">
+      <div class="flex items-center justify-between mb-3">
+        <div class="flex items-center gap-2">
+          <.icon name="hero-rocket-launch" class="h-5 w-5 text-blue-600 dark:text-blue-400" />
+          <h3 class="text-sm font-semibold text-gray-900 dark:text-white">
+            {t("Setup Progress")}
+          </h3>
+          <span class="text-xs text-gray-500 dark:text-gray-400">
+            {@setup_checklist.completed}/{@setup_checklist.total}
+          </span>
+        </div>
+        <button
+          phx-click={JS.hide(to: "#setup-checklist")}
+          class="text-gray-400 hover:text-gray-600 dark:hover:text-gray-300"
+          title={t("Dismiss")}
+        >
+          <.icon name="hero-x-mark" class="h-4 w-4" />
+        </button>
+      </div>
+      <%!-- Progress bar --%>
+      <div class="w-full bg-gray-200 dark:bg-gray-700 rounded-full h-1.5 mb-3">
+        <div
+          class="bg-blue-600 dark:bg-blue-400 h-1.5 rounded-full transition-all duration-500"
+          style={"width: #{@setup_checklist.completed / @setup_checklist.total * 100}%"}
+        >
+        </div>
+      </div>
+      <div class="grid grid-cols-1 sm:grid-cols-2 gap-2">
+        <%= for step <- @setup_checklist.steps do %>
+          <.link
+            navigate={step.link}
+            class={[
+              "flex items-center gap-2.5 rounded-md px-3 py-2 text-sm transition-colors",
+              if(step.done,
+                do: "text-gray-400 dark:text-gray-500",
+                else: "text-gray-700 dark:text-gray-300 hover:bg-blue-100/50 dark:hover:bg-blue-900/20"
+              )
+            ]}
+          >
+            <%= if step.done do %>
+              <.icon name="hero-check-circle-solid" class="h-5 w-5 text-green-500 shrink-0" />
+            <% else %>
+              <div class="h-5 w-5 rounded-full border-2 border-gray-300 dark:border-gray-600 shrink-0" />
+            <% end %>
+            <span class={if step.done, do: "line-through"}>
+              {step.label}
+            </span>
+            <%= if step[:optional] do %>
+              <span class="text-xs text-gray-400 dark:text-gray-500">optional</span>
+            <% end %>
+          </.link>
+        <% end %>
+      </div>
+    </div>
+  <% end %>
+
   <%= if assigns[:summary] && @device_count > 0 do %>
     <%!-- ═══════════════════════════════════════════════
          CONDENSED STATUS BAR — single dense line