feat: add billing tab to organization settings

Implements Phase 6 of Stripe billing integration:
- Add Billing tab to organization settings page
- Display subscription status, device usage, and estimated costs
- "Upgrade to Paid Plan" button for free tier orgs
- "Manage Billing" button to access Stripe Customer Portal
- Billing information panel showing subscription details
- Support for dark mode and responsive design

Also fixes organization name truncation in top navigation:
- Long organization names now show with ellipsis instead of being cut off
- Added max-w-xs constraint and truncate class to org switcher button

lib/towerops_web/components/layouts.ex

@@ -215,10 +215,10 @@ defmodule ToweropsWeb.Layouts do
                       to: "#org-switcher-button"
                     )
                   }
-                  class="inline-flex items-center gap-1 text-sm font-medium text-gray-600 hover:text-gray-900 dark:text-gray-400 dark:hover:text-white transition-colors"
+                  class="inline-flex items-center gap-1 text-sm font-medium text-gray-600 hover:text-gray-900 dark:text-gray-400 dark:hover:text-white transition-colors max-w-xs"
                 >
-                  {@current_organization.name}
-                  <.icon name="hero-chevron-down" class="h-3 w-3" />
+                  <span class="truncate">{@current_organization.name}</span>
+                  <.icon name="hero-chevron-down" class="h-3 w-3 shrink-0" />
                 </button>
                 <div
                   id="org-switcher-menu"

lib/towerops_web/live/org/settings_live.ex

@@ -5,10 +5,12 @@ defmodule ToweropsWeb.Org.SettingsLive do
   alias Towerops.Accounts.UserNotifier
   alias Towerops.Admin.AuditLogger
   alias Towerops.Agents
+  alias Towerops.Billing
   alias Towerops.Gaiia.Client, as: GaiiaClient
   alias Towerops.Integrations
   alias Towerops.Integrations.Integration
   alias Towerops.Organizations
+  alias Towerops.Organizations.SubscriptionLimits
   alias Towerops.Preseem.Client, as: PreseemClient
   alias Towerops.Sonar.Client, as: SonarClient
   alias Towerops.Splynx.Client, as: SplynxClient
@@ -88,6 +90,10 @@ defmodule ToweropsWeb.Org.SettingsLive do
 
     changeset = Organizations.change_organization(organization)
 
+    # Billing information
+    {current_devices, device_limit} = SubscriptionLimits.device_quota(organization)
+    {:ok, cost_info} = Billing.estimated_monthly_cost(organization)
+
     {:ok,
      socket
      |> assign(:organization, organization)
@@ -97,6 +103,10 @@ defmodule ToweropsWeb.Org.SettingsLive do
      |> assign(:assignment_breakdown, assignment_breakdown)
      |> assign(:form, to_form(changeset))
      |> assign(:active_tab, "general")
+     # Billing tab assigns
+     |> assign(:current_devices, current_devices)
+     |> assign(:device_limit, device_limit)
+     |> assign(:estimated_cost, cost_info)
      # Members tab assigns - loaded lazily
      |> assign(:members, [])
      |> assign(:pending_invitations, [])
@@ -468,6 +478,55 @@ defmodule ToweropsWeb.Org.SettingsLive do
     end
   end
 
+  # === Billing events ===
+
+  @impl true
+  def handle_event("upgrade_to_paid", _params, socket) do
+    org = socket.assigns.organization
+
+    success_url = url(~p"/orgs/#{org.slug}/settings?tab=billing&status=success")
+    cancel_url = url(~p"/orgs/#{org.slug}/settings?tab=billing&status=cancelled")
+
+    case Billing.create_checkout_session(org,
+           success_url: success_url,
+           cancel_url: cancel_url
+         ) do
+      {:ok, checkout_url} ->
+        {:noreply, redirect(socket, external: checkout_url)}
+
+      {:error, reason} ->
+        Logger.error("Failed to create checkout session: #{inspect(reason)}")
+
+        {:noreply, put_flash(socket, :error, t("Failed to start checkout. Please try again later."))}
+    end
+  end
+
+  @impl true
+  def handle_event("manage_billing", _params, socket) do
+    org = socket.assigns.organization
+    return_url = url(~p"/orgs/#{org.slug}/settings?tab=billing")
+
+    case Billing.create_portal_session(org, return_url) do
+      {:ok, portal_url} ->
+        {:noreply, redirect(socket, external: portal_url)}
+
+      {:error, :no_stripe_customer} ->
+        {:noreply,
+         put_flash(
+           socket,
+           :error,
+           t("No billing account found. Please upgrade to a paid plan first.")
+         )}
+
+      {:error, reason} ->
+        Logger.error("Failed to create portal session: #{inspect(reason)}")
+
+        {:noreply, put_flash(socket, :error, t("Failed to open billing portal. Please try again later."))}
+    end
+  end
+
+  # === Private helpers (integrations) ===
+
   defp do_test_connection("netbox", socket) do
     {url, token} = extract_netbox_credentials(socket)
 

lib/towerops_web/live/org/settings_live.html.heex

@@ -91,6 +91,16 @@
             {t("Integrations")}
           </.link>
         </li>
+        <li>
+          <.link
+            patch={~p"/orgs/#{@organization.slug}/settings?tab=billing"}
+            class={
+              if @active_tab == "billing", do: "text-indigo-600 dark:text-indigo-400", else: ""
+            }
+          >
+            {t("Billing")}
+          </.link>
+        </li>
       </ul>
     </nav>
   </header>
@@ -2068,4 +2078,139 @@
       <% end %>
     </div>
   <% end %>
+
+  <%= if @active_tab == "billing" do %>
+    <div class="space-y-6 px-4 py-6 sm:p-6 lg:p-8">
+      <div class="border rounded-lg p-6 dark:border-white/10">
+        <h2 class="text-xl font-semibold mb-4 dark:text-white">{t("Subscription & Billing")}</h2>
+
+        <dl class="space-y-3">
+          <div>
+            <dt class="text-sm text-gray-600 dark:text-gray-400">{t("Current Plan")}</dt>
+            <dd class="text-lg font-semibold capitalize dark:text-white">
+              {@organization.subscription_plan || "free"}
+            </dd>
+          </div>
+
+          <div>
+            <dt class="text-sm text-gray-600 dark:text-gray-400">{t("Device Usage")}</dt>
+            <dd class="text-lg dark:text-white">
+              {@current_devices} {t("devices")}
+              <%= if @device_limit != :unlimited do %>
+                <span class="text-gray-500 dark:text-gray-400">
+                  / {@device_limit} {t("limit")}
+                </span>
+              <% end %>
+            </dd>
+          </div>
+
+          <%= if @organization.subscription_plan == "paid" do %>
+            <div>
+              <dt class="text-sm text-gray-600 dark:text-gray-400">
+                {t("Estimated Monthly Cost")}
+              </dt>
+              <dd class="text-2xl font-bold text-green-600 dark:text-green-400">
+                ${@estimated_cost.cost_usd}
+              </dd>
+              <p class="text-xs text-gray-500 dark:text-gray-400 mt-1">
+                {@estimated_cost.billable} {t("billable devices")} × $1.00
+              </p>
+            </div>
+
+            <%= if @organization.subscription_status == "active" do %>
+              <div class="bg-green-50 dark:bg-green-900/20 border border-green-200 dark:border-green-800/50 rounded p-3">
+                <p class="text-sm text-green-800 dark:text-green-300">
+                  ✓ {t("Subscription Active")}
+                </p>
+                <%= if @organization.subscription_current_period_end do %>
+                  <p class="text-xs text-green-600 dark:text-green-400 mt-1">
+                    {t("Next billing")}: {Calendar.strftime(
+                      @organization.subscription_current_period_end,
+                      "%B %d, %Y"
+                    )}
+                  </p>
+                <% end %>
+              </div>
+            <% end %>
+
+            <%= if @organization.subscription_status == "past_due" do %>
+              <div class="bg-yellow-50 dark:bg-yellow-900/20 border border-yellow-200 dark:border-yellow-800/50 rounded p-3">
+                <p class="text-sm text-yellow-800 dark:text-yellow-300">
+                  ⚠ {t("Payment Past Due")}
+                </p>
+                <p class="text-xs text-yellow-600 dark:text-yellow-400 mt-1">
+                  {t("Please update your payment method to avoid service interruption.")}
+                </p>
+              </div>
+            <% end %>
+          <% else %>
+            <div class="bg-blue-50 dark:bg-blue-900/20 border border-blue-200 dark:border-blue-800/50 rounded p-3">
+              <p class="text-sm text-blue-800 dark:text-blue-300">
+                {t("Free Plan - First 10 devices included")}
+              </p>
+              <p class="text-xs text-blue-600 dark:text-blue-400 mt-1">
+                {t("Upgrade to monitor unlimited devices at $1/device/month")}
+              </p>
+            </div>
+          <% end %>
+        </dl>
+
+        <div class="mt-6 flex gap-3">
+          <%= if @organization.subscription_plan == "free" do %>
+            <.button phx-click="upgrade_to_paid" class="btn-primary">
+              {t("Upgrade to Paid Plan")}
+            </.button>
+          <% else %>
+            <.button phx-click="manage_billing" class="btn-secondary">
+              {t("Manage Billing")}
+            </.button>
+          <% end %>
+        </div>
+      </div>
+
+      <%= if @organization.subscription_plan == "paid" do %>
+        <div class="border rounded-lg p-6 dark:border-white/10">
+          <h3 class="text-lg font-semibold mb-3 dark:text-white">{t("Billing Information")}</h3>
+          <dl class="space-y-2 text-sm">
+            <div class="flex justify-between">
+              <dt class="text-gray-600 dark:text-gray-400">{t("Subscription Status")}</dt>
+              <dd class="font-medium capitalize dark:text-white">
+                {@organization.subscription_status}
+              </dd>
+            </div>
+            <%= if @organization.subscription_current_period_start do %>
+              <div class="flex justify-between">
+                <dt class="text-gray-600 dark:text-gray-400">{t("Current Period Start")}</dt>
+                <dd class="font-medium dark:text-white">
+                  {Calendar.strftime(@organization.subscription_current_period_start, "%B %d, %Y")}
+                </dd>
+              </div>
+            <% end %>
+            <%= if @organization.subscription_current_period_end do %>
+              <div class="flex justify-between">
+                <dt class="text-gray-600 dark:text-gray-400">{t("Current Period End")}</dt>
+                <dd class="font-medium dark:text-white">
+                  {Calendar.strftime(@organization.subscription_current_period_end, "%B %d, %Y")}
+                </dd>
+              </div>
+            <% end %>
+            <%= if @organization.payment_method_status do %>
+              <div class="flex justify-between">
+                <dt class="text-gray-600 dark:text-gray-400">{t("Payment Method")}</dt>
+                <dd class={[
+                  "font-medium capitalize",
+                  if(@organization.payment_method_status == "valid",
+                    do: "text-green-600 dark:text-green-400",
+                    else: "text-yellow-600 dark:text-yellow-400"
+                  )
+                ]}>
+                  {String.replace(@organization.payment_method_status, "_", " ")}
+                </dd>
+              </div>
+            <% end %>
+          </dl>
+        </div>
+      <% end %>
+    </div>
+  <% end %>
 </Layouts.authenticated>