Make Stop Capture button red and prominent

- Add --danger/--danger-hover CSS variables (dark + light themes)
- .stop button now uses red background + white text with brighter hover
  (was muted gray, easy to miss)
- Bump 1.22.3, SW cache v34->v35

simtrace2_pysniff/__init__.py

@@ -6,7 +6,7 @@ from .gsmtap import GsmtapSender, GsmtapReceiver
 from .pcap import PcapWriter
 from .dump import FileDumper, format_message
 
-__version__ = '1.22.2'
+__version__ = '1.22.3'
 __all__ = [
     'SniffSession',
     'DeviceDisconnected',