Fixes:
1. Notification click now opens ComposeMainActivity instead of legacy MainActivity
2. WiFi-Only toggle moved to its own 'Network Restriction' section at top of sync settings
3. Added hint explaining WiFi-Connect trigger is not affected by WiFi-Only setting
UI Changes:
- New section header: 'Network Restriction' / 'Netzwerk-Einschränkung'
- WiFi-Only toggle now clearly separated from sync triggers
- Info card shows when WiFi-Only is enabled explaining the exception
ebab347d4b