Initial scaffold

src/activities/weather/WeatherActivity.h

@@ -0,0 +1,51 @@
+#pragma once
+
+#include <WeatherData.h>
+
+#include <string>
+
+#include "../Activity.h"
+#include "util/ButtonNavigator.h"
+
+/**
+ * Weather forecast display activity.
+ * Renders in landscape mode (800x480) with:
+ * - Current conditions (left panel)
+ * - Daily forecast cards (center)
+ * - 48-hour temperature + precipitation graph (bottom)
+ *
+ * On enter: loads cache -> if stale, connects WiFi -> fetches data -> displays.
+ * Keys: Back = return, Confirm = open settings, Left = refresh.
+ */
+class WeatherActivity final : public Activity {
+ public:
+  enum class State { LOADING_CACHE, CHECK_WIFI, WIFI_SELECTION, FETCHING, WEATHER_DISPLAY, ERROR };
+
+  explicit WeatherActivity(GfxRenderer& renderer, MappedInputManager& mappedInput)
+      : Activity("Weather", renderer, mappedInput) {}
+
+  void onEnter() override;
+  void onExit() override;
+  void loop() override;
+  void render(RenderLock&&) override;
+
+ private:
+  ButtonNavigator buttonNavigator;
+  State state = State::LOADING_CACHE;
+  WeatherData weatherData;
+  std::string errorMessage;
+  bool forceRefresh = false;
+
+  void loadAndDisplay();
+  void checkAndConnectWifi();
+  void launchWifiSelection();
+  void onWifiSelectionComplete(bool connected);
+  void fetchWeather();
+
+  // Render sub-sections (landscape 800x480)
+  void renderCurrentConditions(int x, int y, int w, int h);
+  void renderDailyForecast(int x, int y, int w, int h);
+  void renderHourlyGraph(int x, int y, int w, int h);
+
+  bool preventAutoSleep() override { return true; }
+};