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/screens/chrome_required_screen.dart

@@ -8,34 +8,25 @@ class ChromeRequiredScreen extends StatelessWidget {
   Widget build(BuildContext context) {
     final l10n = context.l10n;
     final theme = Theme.of(context);
-    final isDark = theme.brightness == Brightness.dark;
-
+    final colorScheme = theme.colorScheme;
     return Scaffold(
       body: Container(
         width: double.infinity,
         padding: const EdgeInsets.symmetric(horizontal: 32),
-        decoration: BoxDecoration(
-          gradient: LinearGradient(
-            begin: Alignment.topLeft,
-            end: Alignment.bottomRight,
-            colors: isDark
-                ? [const Color(0xFF1A1A1A), const Color(0xFF0D0D0D)]
-                : [const Color(0xFFF5F7FA), const Color(0xFFE4E7EB)],
-          ),
-        ),
+        color: colorScheme.surface,
         child: Column(
           mainAxisAlignment: MainAxisAlignment.center,
           children: [
             Container(
               padding: const EdgeInsets.all(24),
               decoration: BoxDecoration(
-                color: Colors.orange.withValues(alpha: 0.1),
+                color: colorScheme.tertiaryContainer.withValues(alpha: 0.4),
                 shape: BoxShape.circle,
               ),
-              child: const Icon(
+              child: Icon(
                 Icons.browser_not_supported_rounded,
                 size: 80,
-                color: Colors.orange,
+                color: colorScheme.tertiary,
               ),
             ),
             const SizedBox(height: 32),
@@ -44,7 +35,7 @@ class ChromeRequiredScreen extends StatelessWidget {
               textAlign: TextAlign.center,
               style: theme.textTheme.headlineMedium?.copyWith(
                 fontWeight: FontWeight.bold,
-                color: isDark ? Colors.white : Colors.black87,
+                color: colorScheme.onSurface,
               ),
             ),
             const SizedBox(height: 16),
@@ -52,7 +43,7 @@ class ChromeRequiredScreen extends StatelessWidget {
               l10n.scanner_chromeRequiredMessage,
               textAlign: TextAlign.center,
               style: theme.textTheme.bodyLarge?.copyWith(
-                color: isDark ? Colors.white70 : Colors.black54,
+                color: colorScheme.onSurfaceVariant,
                 height: 1.5,
               ),
             ),
@@ -62,19 +53,19 @@ class ChromeRequiredScreen extends StatelessWidget {
             Container(
               padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 12),
               decoration: BoxDecoration(
-                color: Colors.blue.withValues(alpha: 0.1),
+                color: colorScheme.secondaryContainer.withValues(alpha: 0.4),
                 borderRadius: BorderRadius.circular(30),
-                border: Border.all(color: Colors.blue.withValues(alpha: 0.3)),
+                border: Border.all(color: colorScheme.outline.withValues(alpha: 0.4)),
               ),
               child: Row(
                 mainAxisSize: MainAxisSize.min,
                 children: [
-                  const Icon(Icons.info_outline, size: 20, color: Colors.blue),
+                  Icon(Icons.info_outline, size: 20, color: colorScheme.secondary),
                   const SizedBox(width: 12),
                   Text(
-                    "Web Bluetooth requires a Chromium browser",
+                    l10n.chrome_bluetoothRequiresChromium,
                     style: theme.textTheme.bodyMedium?.copyWith(
-                      color: Colors.blue,
+                      color: colorScheme.onSecondaryContainer,
                       fontWeight: FontWeight.w500,
                     ),
                   ),