Weather: default to 5-day forecast, add weekday+date header line

- forecast_days now defaults to 5 (was 3) across default_settings(),
  check()'s fallback, and the settings form's pre-selected option.
- New show_date setting (on by default): weekday + date in the same
  "Samstag, 25. Juli" format Clock already used. Combined with the
  city name into one header line above the icon/temp block when both
  are on ("Münster · Samstag, 25. Juli"), each independently
  toggleable.
- Moved the weekday/month name lists and the "Weekday, D. Month"
  formatting out of clock.py into render_utils.format_date_de(), so
  Weather reuses the exact same formatting instead of a second copy
  that could drift.

screens/weather.py

@@ -8,7 +8,7 @@ import requests
 from PIL import Image, ImageDraw
 
 from screens.base import Screen
-from screens.render_utils import load_font, text_width, truncate_to_width
+from screens.render_utils import format_date_de, load_font, text_width, truncate_to_width
 from screens.weather_icons import WMO_CODES, draw_weather_icon
 
 BLACK = (0, 0, 0)
@@ -31,12 +31,13 @@ class WeatherScreen(Screen):
 
     def default_settings(self) -> dict:
         return {
-            "city": "", "latitude": None, "longitude": None, "forecast_days": 3, "update_minutes": 30,
+            "city": "", "latitude": None, "longitude": None, "forecast_days": 5, "update_minutes": 30,
             "show_feels_like": True,
             "show_high_low": True,
             "show_rain_chance": True,
             "show_hourly_graph": True,
             "show_city": True,
+            "show_date": True,
         }
 
     def get_poll_interval(self, settings: dict) -> int:
@@ -79,9 +80,9 @@ class WeatherScreen(Screen):
             logger.warning("Weather screen has no latitude/longitude configured")
             return None
 
-        forecast_days = settings.get("forecast_days", 3)
+        forecast_days = settings.get("forecast_days", 5)
         if forecast_days not in FORECAST_DAY_CHOICES:
-            forecast_days = 3
+            forecast_days = 5
 
         response = requests.get(
             "https://api.open-meteo.com/v1/forecast",
@@ -214,26 +215,32 @@ class WeatherScreen(Screen):
         text_block_h = temp_h + text_gap + desc_h + ((text_gap + extra_h) if extra_line else 0)
         current_h = max(icon_size, text_block_h)
 
-        # City name, above the icon/temp block -- just the city itself, not
-        # the full "City, State, Country" geocode label (too long/cluttered
-        # for a dashboard header). Nothing to show for manually-entered
-        # coordinates, since there's no resolved place name for those.
-        city_font = load_font(size=int(scale * 0.045), bold=True)
-        city_label = ""
-        city_h = city_gap = city_top = 0
+        # Header line above the icon/temp block: city name (just the city
+        # itself, not the full "City, State, Country" geocode label -- too
+        # cluttered for a dashboard) and/or today's weekday + date, same
+        # format as the Clock screen. Nothing to show for city specifically
+        # with manually-entered coordinates, since there's no resolved place
+        # name for those.
+        header_font = load_font(size=int(scale * 0.045), bold=True)
+        header_parts = []
         if settings.get("show_city", True) and settings.get("city"):
-            city_label = truncate_to_width(draw, settings["city"].split(",")[0].strip(), city_font, width - 2 * pad)
-        if city_label:
-            city_left, city_top, city_right, city_bottom = draw.textbbox((0, 0), city_label, font=city_font)
-            city_h = city_bottom - city_top
-            city_gap = height * 0.025
+            header_parts.append(settings["city"].split(",")[0].strip())
+        if settings.get("show_date", True):
+            header_parts.append(format_date_de())
+        header_label = truncate_to_width(draw, " · ".join(header_parts), header_font, width - 2 * pad) if header_parts else ""
 
-        total_top_h = city_h + city_gap + current_h
+        header_h = header_gap = header_top = 0
+        if header_label:
+            header_left, header_top, header_right, header_bottom = draw.textbbox((0, 0), header_label, font=header_font)
+            header_h = header_bottom - header_top
+            header_gap = height * 0.025
+
+        total_top_h = header_h + header_gap + current_h
         top_pad = (height - total_top_h) / 2 if lower_sections == 0 else height * 0.05
 
-        if city_label:
-            draw.text((pad, top_pad - city_top), city_label, font=city_font, fill="black")
-        block_top = top_pad + city_h + city_gap
+        if header_label:
+            draw.text((pad, top_pad - header_top), header_label, font=header_font, fill="black")
+        block_top = top_pad + header_h + header_gap
 
         icon_cx = pad + icon_size / 2
         icon_cy = block_top + current_h / 2