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.

test/screens/tcp_flow_test.dart

@@ -123,11 +123,13 @@ void main() {
     );
     await tester.pumpAndSettle();
 
-    await tester.tap(find.widgetWithText(FloatingActionButton, 'TCP'));
+    final scannerContext = tester.element(find.byType(ScannerScreen));
+    final scannerL10n = AppLocalizations.of(scannerContext);
+    await tester.tap(find.byTooltip(scannerL10n.connectionChoiceTcpLabel));
     await tester.pumpAndSettle();
     expect(find.byType(TcpScreen), findsOneWidget);
 
-    await tester.tap(find.widgetWithText(FloatingActionButton, 'Bluetooth'));
+    await tester.tap(find.widgetWithText(OutlinedButton, 'Bluetooth'));
     await tester.pumpAndSettle();
 
     expect(find.byType(TcpScreen), findsNothing);

test/screens/usb_flow_test.dart

@@ -157,10 +157,18 @@ void main() {
     );
     await tester.pumpAndSettle();
 
+    final context = tester.element(find.byType(ScannerScreen));
+    final l10n = AppLocalizations.of(context);
     if (PlatformInfo.supportsUsbSerial) {
-      expect(find.widgetWithText(FloatingActionButton, 'USB'), findsOneWidget);
+      expect(
+        find.byTooltip(l10n.connectionChoiceUsbLabel),
+        findsOneWidget,
+      );
     } else {
-      expect(find.widgetWithText(FloatingActionButton, 'USB'), findsNothing);
+      expect(
+        find.byTooltip(l10n.connectionChoiceUsbLabel),
+        findsNothing,
+      );
     }
 
     // ScannerScreen.dispose() schedules disconnect work that debounces notify.
@@ -186,13 +194,13 @@ void main() {
 
     final context = tester.element(find.byType(ScannerScreen));
     final l10n = AppLocalizations.of(context);
-    expect(find.text(l10n.scanner_scan), findsOneWidget);
+    expect(find.text(l10n.scanner_scan), findsWidgets);
 
     if (PlatformInfo.supportsUsbSerial) {
-      expect(find.text(l10n.connectionChoiceUsbLabel), findsOneWidget);
+      expect(find.byTooltip(l10n.connectionChoiceUsbLabel), findsOneWidget);
     }
     if (!PlatformInfo.isWeb) {
-      expect(find.text(l10n.connectionChoiceTcpLabel), findsOneWidget);
+      expect(find.byTooltip(l10n.connectionChoiceTcpLabel), findsOneWidget);
     }
 
     await tester.pumpWidget(const SizedBox.shrink());