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/helpers/path_helper.dart

@@ -8,24 +8,29 @@ class PathHelper {
         .join(',');
   }
 
+  static String hopHex(int byte) {
+    return byte.toRadixString(16).padLeft(2, '0').toUpperCase();
+  }
+
+  static String? hopName(int byte, List<Contact> allContacts) {
+    final matches = allContacts
+        .where(
+          (c) =>
+              c.publicKey.first == byte &&
+              (c.type == advTypeRepeater || c.type == advTypeRoom),
+        )
+        .toList();
+    if (matches.isEmpty) return null;
+    if (matches.length == 1) return matches.first.name;
+    return matches.map((c) => c.name).join(' | ');
+  }
+
   static String resolvePathNames(
     List<int> pathBytes,
     List<Contact> allContacts,
   ) {
     return pathBytes
-        .map((b) {
-          final hex = b.toRadixString(16).padLeft(2, '0').toUpperCase();
-          final matches = allContacts
-              .where(
-                (c) =>
-                    c.publicKey.first == b &&
-                    (c.type == advTypeRepeater || c.type == advTypeRoom),
-              )
-              .toList();
-          if (matches.isEmpty) return hex;
-          if (matches.length == 1) return matches.first.name;
-          return matches.map((c) => c.name).join(' | ');
-        })
+        .map((b) => hopName(b, allContacts) ?? hopHex(b))
         .join(' \u2192 ');
   }
 }