Refactor Cayenne LPP parsing with error handling and logging

- Added error handling and logging to the Cayenne LPP parsing methods to manage malformed data gracefully.
- Improved the structure of the parsing logic for better readability and maintainability.
- Updated the Contact model to include error handling during frame parsing.
- Refactored Channels, Contacts, Map, and Neighbours screens to utilize a new AppBarTitle widget for consistent app bar design.
- Enhanced the BatteryIndicator widget to display SNR information for direct repeaters.
- Introduced SNRUi class for better management of SNR icon and text representation.
- Improved error handling in PathTraceMap and Neighbours screens to log errors appropriately.

lib/screens/contacts_screen.dart

@@ -3,6 +3,8 @@ import 'dart:async';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:meshcore_open/screens/path_trace_map.dart';
+import 'package:meshcore_open/utils/app_logger.dart';
+import 'package:meshcore_open/widgets/app_bar.dart';
 import 'package:provider/provider.dart';
 
 import '../connector/meshcore_connector.dart';
@@ -16,7 +18,6 @@ import '../utils/dialog_utils.dart';
 import '../utils/disconnect_navigation_mixin.dart';
 import '../utils/emoji_utils.dart';
 import '../utils/route_transitions.dart';
-import '../widgets/battery_indicator.dart';
 import '../widgets/list_filter_widget.dart';
 import '../widgets/empty_state.dart';
 import '../widgets/quick_switch_bar.dart';
@@ -90,79 +91,90 @@ class _ContactsScreenState extends State<ContactsScreen>
     _frameSubscription = connector.receivedFrames.listen((frame) {
       if (frame.isEmpty) return;
       final frameBuffer = BufferReader(frame);
-      final code = frameBuffer.readUInt8();
+      try {
+        final code = frameBuffer.readUInt8();
 
-      if (code == respCodeExportContact) {
-        final advertPacket = frameBuffer.readRemainingBytes();
-        // Validate packet has expected minimum size (98+ bytes per protocol)
-        if (advertPacket.length < 98) {
-          if (mounted) {
+        if (code == respCodeExportContact) {
+          final advertPacket = frameBuffer.readRemainingBytes();
+          // Validate packet has expected minimum size (98+ bytes per protocol)
+          if (advertPacket.length < 98) {
+            if (mounted) {
+              ScaffoldMessenger.of(context).showSnackBar(
+                SnackBar(
+                  content: Text(context.l10n.contacts_invalidAdvertFormat),
+                ),
+              );
+            }
+            _pendingOperations.remove(ContactOperationType.export);
+            return;
+          }
+          final hexString = pubKeyToHex(advertPacket);
+          Clipboard.setData(ClipboardData(text: "meshcore://$hexString"));
+        }
+
+        if (code == respCodeOk) {
+          // Show a snackbar indicating success
+          if (!mounted) return;
+
+          if (_pendingOperations.contains(ContactOperationType.import)) {
+            ScaffoldMessenger.of(context).showSnackBar(
+              SnackBar(content: Text(context.l10n.contacts_contactImported)),
+            );
+          }
+
+          if (_pendingOperations.contains(ContactOperationType.zeroHopShare)) {
             ScaffoldMessenger.of(context).showSnackBar(
               SnackBar(
-                content: Text(context.l10n.contacts_invalidAdvertFormat),
+                content: Text(context.l10n.contacts_zeroHopContactAdvertSent),
               ),
             );
           }
-          _pendingOperations.remove(ContactOperationType.export);
-          return;
-        }
-        final hexString = pubKeyToHex(advertPacket);
-        Clipboard.setData(ClipboardData(text: "meshcore://$hexString"));
-      }
 
-      if (code == respCodeOk) {
-        // Show a snackbar indicating success
-        if (!mounted) return;
+          if (_pendingOperations.contains(ContactOperationType.export)) {
+            ScaffoldMessenger.of(context).showSnackBar(
+              SnackBar(
+                content: Text(context.l10n.contacts_contactAdvertCopied),
+              ),
+            );
+          }
 
-        if (_pendingOperations.contains(ContactOperationType.import)) {
-          ScaffoldMessenger.of(context).showSnackBar(
-            SnackBar(content: Text(context.l10n.contacts_contactImported)),
-          );
+          _pendingOperations.clear();
         }
 
-        if (_pendingOperations.contains(ContactOperationType.zeroHopShare)) {
-          ScaffoldMessenger.of(context).showSnackBar(
-            SnackBar(
-              content: Text(context.l10n.contacts_zeroHopContactAdvertSent),
-            ),
-          );
+        if (code == respCodeErr) {
+          // Show a snackbar indicating failure
+          if (!mounted) return;
+
+          if (_pendingOperations.contains(ContactOperationType.import)) {
+            ScaffoldMessenger.of(context).showSnackBar(
+              SnackBar(
+                content: Text(context.l10n.contacts_contactImportFailed),
+              ),
+            );
+          }
+
+          if (_pendingOperations.contains(ContactOperationType.zeroHopShare)) {
+            ScaffoldMessenger.of(context).showSnackBar(
+              SnackBar(
+                content: Text(context.l10n.contacts_zeroHopContactAdvertFailed),
+              ),
+            );
+          }
+          if (_pendingOperations.contains(ContactOperationType.export)) {
+            ScaffoldMessenger.of(context).showSnackBar(
+              SnackBar(
+                content: Text(context.l10n.contacts_contactAdvertCopyFailed),
+              ),
+            );
+          }
+
+          _pendingOperations.clear();
         }
-
-        if (_pendingOperations.contains(ContactOperationType.export)) {
-          ScaffoldMessenger.of(context).showSnackBar(
-            SnackBar(content: Text(context.l10n.contacts_contactAdvertCopied)),
-          );
-        }
-
-        _pendingOperations.clear();
-      }
-
-      if (code == respCodeErr) {
-        // Show a snackbar indicating failure
-        if (!mounted) return;
-
-        if (_pendingOperations.contains(ContactOperationType.import)) {
-          ScaffoldMessenger.of(context).showSnackBar(
-            SnackBar(content: Text(context.l10n.contacts_contactImportFailed)),
-          );
-        }
-
-        if (_pendingOperations.contains(ContactOperationType.zeroHopShare)) {
-          ScaffoldMessenger.of(context).showSnackBar(
-            SnackBar(
-              content: Text(context.l10n.contacts_zeroHopContactAdvertFailed),
-            ),
-          );
-        }
-        if (_pendingOperations.contains(ContactOperationType.export)) {
-          ScaffoldMessenger.of(context).showSnackBar(
-            SnackBar(
-              content: Text(context.l10n.contacts_contactAdvertCopyFailed),
-            ),
-          );
-        }
-
-        _pendingOperations.clear();
+      } catch (e) {
+        appLogger.error(
+          'Error processing received frame: $e',
+          tag: 'ContactsScreen',
+        );
       }
     });
   }
@@ -229,9 +241,8 @@ class _ContactsScreenState extends State<ContactsScreen>
       canPop: allowBack,
       child: Scaffold(
         appBar: AppBar(
-          leading: BatteryIndicator(connector: connector),
-          title: Text(context.l10n.contacts_title),
-          centerTitle: true,
+          //leading: ,
+          title: AppBarTitle(context.l10n.contacts_title, null),
           automaticallyImplyLeading: false,
           actions: [
             PopupMenuButton(