fix(weather): use Map.get for fallback comment access; add WeatherLive render tests

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

@@ -182,7 +182,7 @@
           </dl>
           <div class="mt-2 text-xs text-gray-500 dark:text-gray-400">
             <strong>{gettext("Raw comment")}:</strong> {@weather_packet.comment ||
-              @weather_packet["comment"]}
+              Map.get(@weather_packet, "comment")}
           </div>
         </div>
       </div>

test/aprsme_web/live/weather_live/callsign_view_test.exs

@@ -95,6 +95,71 @@ defmodule AprsmeWeb.WeatherLive.CallsignViewTest do
     end
   end
 
+  describe "mount with existing weather packet" do
+    import Aprsme.PacketsFixtures
+
+    test "renders weather data when a weather packet exists", %{conn: conn} do
+      _p =
+        packet_fixture(%{
+          sender: "WXSTA-1",
+          base_callsign: "WXSTA",
+          ssid: "1",
+          received_at: DateTime.utc_now(),
+          lat: Decimal.new("33.0"),
+          lon: Decimal.new("-96.0"),
+          has_position: true,
+          has_weather: true,
+          data_type: "weather",
+          temperature: 72.5,
+          humidity: 55,
+          pressure: 1013.0,
+          wind_speed: 5.5,
+          wind_direction: 180,
+          wind_gust: 10.0,
+          rain_1h: 0.0,
+          rain_24h: 0.25,
+          rain_since_midnight: 0.1,
+          comment: "A brief note"
+        })
+
+      {:ok, _lv, html} = live(conn, ~p"/weather/WXSTA-1", on_error: :warn)
+      assert html =~ "WXSTA-1"
+    end
+
+    test "broadcast of new weather packet for tracked callsign updates the view", %{conn: conn} do
+      _p =
+        packet_fixture(%{
+          sender: "WXTRK-1",
+          base_callsign: "WXTRK",
+          ssid: "1",
+          received_at: DateTime.add(DateTime.utc_now(), -3600, :second),
+          lat: Decimal.new("33.0"),
+          lon: Decimal.new("-96.0"),
+          has_weather: true,
+          temperature: 70.0,
+          humidity: 50
+        })
+
+      {:ok, lv, _html} = live(conn, ~p"/weather/WXTRK-1", on_error: :warn)
+
+      # Newer packet for the SAME callsign with weather data — should trigger update.
+      new_packet = %{
+        sender: "WXTRK-1",
+        received_at: DateTime.utc_now(),
+        temperature: 72.0,
+        humidity: 55,
+        pressure: 1015.0,
+        wind_speed: 3,
+        wind_direction: 90,
+        rain_1h: 0
+      }
+
+      send(lv.pid, {:postgres_packet, new_packet})
+      Process.sleep(50)
+      assert Process.alive?(lv.pid)
+    end
+  end
+
   describe "live packet broadcast handling" do
     test "ignores non-matching postgres_packet broadcasts", %{conn: conn} do
       {:ok, lv, _html} = live(conn, ~p"/weather/OWNCALL", on_error: :warn)