feat: use official Splitwise app icon for brand assets

Replaces the generated placeholder icon.png/icon@2x.png with the actual
Splitwise app icon, cropped to its transparent-background content bbox
and resized to the required 256x256/512x512 dimensions. Matches how
other HA integrations (e.g. Spotify) use the service's real logo for
brand images.

Author: sriramsv

custom_components/splitwise/brand/icon.png

@@ -8,5 +8,5 @@
     "iot_class": "cloud_polling",
     "issue_tracker": "https://github.com/sriramsv/custom_component_splitwise/issues",
     "requirements": ["splitwise==3.0.0"],
-    "version": "0.2.9"
+    "version": "0.2.10"
   }