map view (Leaflet + OSM), iOS switches, Alarm → Benachrichtigungen

* flats: new lat/lng columns (migration v3); alert geocodes every new flat
  through googlemaps and ships coords in the payload
* web: CSP extended for unpkg (leaflet.css) + tile.openstreetmap.org
* Wohnungen tab: Liste/Karte view toggle (segmented, CSS-only via :has(),
  selection persisted in localStorage). Karte shows passende flats as Pins
  on an OSM tile map; Popup per Pin mit Adresse, Zimmer/m²/€ und Link
* Top-strip toggles are now proper iOS-style toggle switches (single
  rounded knob sliding in a pill, red when on), no descriptive subtitle
* Alarm-Karte verlinkt jetzt auf /einstellungen/benachrichtigungen
  (Filter-Karte bleibt /einstellungen/filter)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

alert/flat.py

@@ -28,6 +28,7 @@ class Flat:
         self.id = self.link  # we could use data.get('id', None) but link is easier to debug
         self.gmaps = maps.Maps()
         self._connectivity = None
+        self._coords = None
         self.address_link_gmaps = f"https://www.google.com/maps/search/?api=1&query={quote(self.address)}"
 
     def __str__(self):
@@ -59,6 +60,12 @@ class Flat:
             self._connectivity = self.gmaps.calculate_score(self.address)
         return self._connectivity
 
+    @property
+    def coords(self):
+        if self._coords is None:
+            self._coords = self.gmaps.geocode(self.address) or (None, None)
+        return self._coords
+
     @property
     def display_address(self):
         if ',' in self.address:

alert/main.py

@@ -32,6 +32,7 @@ class FlatAlerter:
 
     def _flat_payload(self, flat: Flat) -> dict:
         c = flat.connectivity
+        lat, lng = flat.coords
         return {
             "id": flat.id,
             "link": flat.link,
@@ -53,6 +54,8 @@ class FlatAlerter:
             "energy_value": flat.energy_value,
             "energy_certificate": flat.energy_certificate,
             "address_link_gmaps": flat.address_link_gmaps,
+            "lat": lat,
+            "lng": lng,
             "connectivity": {
                 "morning_time": c.get("morning_time", 0),
                 "morning_transfers": c.get("morning_transfers", 0),

alert/maps.py

@@ -23,6 +23,20 @@ class Maps:
     def __init__(self):
         self.gmaps = googlemaps.Client(key=GMAPS_API_KEY)
 
+    def geocode(self, address):
+        """Return (lat, lng) or None for a Berlin address string."""
+        if not address:
+            return None
+        try:
+            res = self.gmaps.geocode(f"{address}, Berlin, Germany")
+            if not res:
+                return None
+            loc = res[0]["geometry"]["location"]
+            return (float(loc["lat"]), float(loc["lng"]))
+        except Exception as e:
+            logger.warning("geocode failed for %r: %s", address, e)
+            return None
+
     def _get_next_weekday(self, date, weekday):
         days_ahead = weekday - date.weekday()
         if days_ahead <= 0: