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/widgets/byte_count_input.dart

@@ -86,7 +86,7 @@ class ByteCountedTextField extends StatelessWidget {
         final counterColor = ratio > errorThreshold
             ? Theme.of(context).colorScheme.error
             : ratio > warningThreshold
-            ? Colors.orange
+            ? Theme.of(context).colorScheme.tertiary
             : Theme.of(context).colorScheme.onSurfaceVariant;
 
         return Column(
@@ -118,8 +118,9 @@ class ByteCountedTextField extends StatelessWidget {
               textInputAction: textInputAction,
               onSubmitted: onSubmitted,
             ),
-            if (showCounter)
-              Padding(
+            Opacity(
+              opacity: showCounter ? 1 : 0,
+              child: Padding(
                 padding: const EdgeInsets.only(top: 4, right: 4),
                 child: Align(
                   alignment: Alignment.centerRight,
@@ -129,6 +130,7 @@ class ByteCountedTextField extends StatelessWidget {
                   ),
                 ),
               ),
+            ),
           ],
         );
       },