Fix map loading and tab navigation v0.4.1

.env.example

@@ -11,11 +11,12 @@ MAX_UPLOAD_MB=150
 LOG_LEVEL=INFO
 
 # Optional map/geocoder overrides. Existing .env files may omit these.
-MAP_TILE_URL=https://tile.openstreetmap.org/{z}/{x}/{y}.png
+# Map tiles are fetched by the backend and served same-origin to the browser.
+MAP_TILE_SOURCE_URL=https://tile.openstreetmap.org/{z}/{x}/{y}.png
 MAP_ATTRIBUTION=© OpenStreetMap contributors
 DEFAULT_MAP_LAT=64.5
 DEFAULT_MAP_LON=11.0
 DEFAULT_MAP_ZOOM=5
 GEOCODER_URL=https://nominatim.openstreetmap.org/search
 # Optional custom identification sent to the geocoder. The default uses APP_NAME, version and APP_URL.
-# GEOCODER_USER_AGENT=MorkPhotoDateEditor/0.4 (+https://edit.mork.fyi)
+# GEOCODER_USER_AGENT=MorkPhotoDateEditor/0.4.1 (+https://edit.mork.fyi)