Fix KeyError on :data when rendering raw broadcast packets in callsign view

Raw APRS broadcast payloads don't have a :data key (only %Packet{}
structs do). Use Map.get/3 instead of dot-access to handle both cases.

lib/aprsme_web/live/packets_live/callsign_view.html.heex

@@ -60,7 +60,7 @@
                   </td>
                   <td>
                     <span class="text-sm font-mono">
-                      <% info_field = (packet.data || %{})["information_field"] || "" %>
+                      <% info_field = (Map.get(packet, :data) || %{})["information_field"] || "" %>
                       <%= if String.length(info_field) > 50 do %>
                         <span title={info_field}>
                           {String.slice(info_field, 0, 50)}...

test/aprsme_web/live/packets_live/callsign_view_test.exs

@@ -0,0 +1,44 @@
+defmodule AprsmeWeb.PacketsLive.CallsignViewTest do
+  use AprsmeWeb.ConnCase
+
+  import Phoenix.LiveViewTest
+
+  describe "live packet broadcast" do
+    test "handles raw broadcast packet without :data key", %{conn: conn} do
+      {:ok, view, _html} = live(conn, "/packets/DB0WUN-13")
+
+      # Simulate a raw broadcast payload (as it arrives from the APRS pipeline)
+      # This map does NOT have a :data key — only %Packet{} structs do
+      raw_payload = %{
+        sender: "DB0WUN-13",
+        data_type: :weather,
+        destination: "APN000",
+        path: "TCPIP*,qAC,T2EISBERG",
+        base_callsign: "DB0WUN",
+        ssid: "13",
+        received_at: DateTime.utc_now(),
+        latitude: Decimal.new("50.0001"),
+        longitude: Decimal.new("12.1393"),
+        temperature: 31,
+        humidity: 89,
+        wind_speed: 3,
+        comment: "232/003g009t031r000p000P000b10215h89L000eMB63",
+        device_identifier: "APN000",
+        data_extended: %{
+          data_type: :weather,
+          comment: "232/003g009t031r000p000P000b10215h89L000eMB63",
+          latitude: Decimal.new("50.0001"),
+          longitude: Decimal.new("12.1393"),
+          symbol_code: "_",
+          symbol_table_id: "/"
+        }
+      }
+
+      AprsmeWeb.Endpoint.broadcast!("aprs_messages", "packet", raw_payload)
+
+      # Should render without crashing
+      html = render(view)
+      assert html =~ "DB0WUN-13"
+    end
+  end
+end