feat: add contact UI helpers and path editor for routing management

- Implemented contactTypeIcon and contactTypeColor functions for better UI representation of contact types.
- Created colorForName and firstCharacterOrEmoji functions to enhance contact display.
- Developed PathEditorSheet widget for managing contact paths with a user-friendly interface.
- Introduced RoutingSheet for managing contact routing modes and displaying path history.
- Added a script for generating proof of concept (PoC) payloads for clipboard contact import validation.

lib/connector/meshcore_uuids.dart

@@ -3,6 +3,10 @@ class MeshCoreUuids {
   static const String rxCharacteristic = "6e400002-b5a3-f393-e0a9-e50e24dcca9e";
   static const String txCharacteristic = "6e400003-b5a3-f393-e0a9-e50e24dcca9e";
 
+  /// Known advertised-name prefixes used by stock MeshCore firmware builds.
+  /// Discovery no longer filters on these (it filters on the [service] UUID so
+  /// that community forks with custom names are still found); kept for
+  /// reference and possible future display heuristics.
   static const List<String> deviceNamePrefixes = [
     "MeshCore-",
     "Whisper-",