v0.10.3-etke35

• 🗑️ Add "Purge Remote Media" button
• 📬 Server Notifications indicator and page
• Use the protocol (http://,https://) from homeserver URL for /.well-known/matrix/client lookups
• Correctly handle MXIDs with not just-domain homeservers (e.g., @user:example.com:1234 or @user:2001:0db8:85a3:0000:0000:8a2e:0370:7334)