feat: Refactor repeater resolution logic across multiple screens

lib/screens/neighbors_screen.dart

@@ -44,6 +44,24 @@ class _NeighborsScreenState extends State<NeighborsScreen> {
   PathSelection? _pendingStatusSelection;
   List<Map<String, dynamic>>? _parsedNeighbors;
 
+  int _resolveRepeaterIndex = -1;
+
+  Contact _resolveRepeater(MeshCoreConnector connector) {
+    if (_resolveRepeaterIndex >= 0 &&
+        _resolveRepeaterIndex < connector.contacts.length &&
+        connector.contacts[_resolveRepeaterIndex].publicKeyHex ==
+            widget.repeater.publicKeyHex) {
+      return connector.contacts[_resolveRepeaterIndex];
+    }
+    _resolveRepeaterIndex = connector.contacts.indexWhere(
+      (c) => c.publicKeyHex == widget.repeater.publicKeyHex,
+    );
+    if (_resolveRepeaterIndex == -1) {
+      return widget.repeater;
+    }
+    return connector.contacts[_resolveRepeaterIndex];
+  }
+
   @override
   void initState() {
     super.initState();
@@ -163,13 +181,6 @@ class _NeighborsScreenState extends State<NeighborsScreen> {
     }
   }
 
-  Contact _resolveRepeater(MeshCoreConnector connector) {
-    return connector.contacts.firstWhere(
-      (c) => c.publicKeyHex == widget.repeater.publicKeyHex,
-      orElse: () => widget.repeater,
-    );
-  }
-
   Future<void> _loadNeighbors() async {
     if (_commandService == null) return;
 

lib/screens/repeater_cli_screen.dart

@@ -77,11 +77,22 @@ class _RepeaterCliScreenState extends State<RepeaterCliScreen> {
     });
   }
 
+  int _resolveRepeaterIndex = -1;
+
   Contact _resolveRepeater(MeshCoreConnector connector) {
-    return connector.contacts.firstWhere(
+    if (_resolveRepeaterIndex >= 0 &&
+        _resolveRepeaterIndex < connector.contacts.length &&
+        connector.contacts[_resolveRepeaterIndex].publicKeyHex ==
+            widget.repeater.publicKeyHex) {
+      return connector.contacts[_resolveRepeaterIndex];
+    }
+    _resolveRepeaterIndex = connector.contacts.indexWhere(
       (c) => c.publicKeyHex == widget.repeater.publicKeyHex,
-      orElse: () => widget.repeater,
     );
+    if (_resolveRepeaterIndex == -1) {
+      return widget.repeater;
+    }
+    return connector.contacts[_resolveRepeaterIndex];
   }
 
   void _handleTextMessageResponse(Uint8List frame) {

lib/screens/repeater_settings_screen.dart

@@ -129,11 +129,22 @@ class _RepeaterSettingsScreenState extends State<RepeaterSettingsScreen> {
     _commandService?.handleResponse(widget.repeater, parsed.text);
   }
 
+  int _resolveRepeaterIndex = -1;
+
   Contact _resolveRepeater(MeshCoreConnector connector) {
-    return connector.contacts.firstWhere(
+    if (_resolveRepeaterIndex >= 0 &&
+        _resolveRepeaterIndex < connector.contacts.length &&
+        connector.contacts[_resolveRepeaterIndex].publicKeyHex ==
+            widget.repeater.publicKeyHex) {
+      return connector.contacts[_resolveRepeaterIndex];
+    }
+    _resolveRepeaterIndex = connector.contacts.indexWhere(
       (c) => c.publicKeyHex == widget.repeater.publicKeyHex,
-      orElse: () => widget.repeater,
     );
+    if (_resolveRepeaterIndex == -1) {
+      return widget.repeater;
+    }
+    return connector.contacts[_resolveRepeaterIndex];
   }
 
   bool _matchesRepeaterPrefix(Uint8List prefix) {

lib/screens/repeater_status_screen.dart

@@ -91,11 +91,22 @@ class _RepeaterStatusScreenState extends State<RepeaterStatusScreen> {
     });
   }
 
+  int _resolveRepeaterIndex = -1;
+
   Contact _resolveRepeater(MeshCoreConnector connector) {
-    return connector.contacts.firstWhere(
+    if (_resolveRepeaterIndex >= 0 &&
+        _resolveRepeaterIndex < connector.contacts.length &&
+        connector.contacts[_resolveRepeaterIndex].publicKeyHex ==
+            widget.repeater.publicKeyHex) {
+      return connector.contacts[_resolveRepeaterIndex];
+    }
+    _resolveRepeaterIndex = connector.contacts.indexWhere(
       (c) => c.publicKeyHex == widget.repeater.publicKeyHex,
-      orElse: () => widget.repeater,
     );
+    if (_resolveRepeaterIndex == -1) {
+      return widget.repeater;
+    }
+    return connector.contacts[_resolveRepeaterIndex];
   }
 
   void _handleTextMessageResponse(Uint8List frame) {

lib/screens/telemetry_screen.dart

@@ -38,6 +38,24 @@ class _TelemetryScreenState extends State<TelemetryScreen> {
 
   int _tripTime = 0;
 
+  int _resolveContactIndex = -1;
+
+  Contact _resolveContact(MeshCoreConnector connector) {
+    if (_resolveContactIndex >= 0 &&
+        _resolveContactIndex < connector.contacts.length &&
+        connector.contacts[_resolveContactIndex].publicKeyHex ==
+            widget.contact.publicKeyHex) {
+      return connector.contacts[_resolveContactIndex];
+    }
+    _resolveContactIndex = connector.contacts.indexWhere(
+      (c) => c.publicKeyHex == widget.contact.publicKeyHex,
+    );
+    if (_resolveContactIndex == -1) {
+      return widget.contact;
+    }
+    return connector.contacts[_resolveContactIndex];
+  }
+
   @override
   void initState() {
     super.initState();
@@ -144,7 +162,7 @@ class _TelemetryScreenState extends State<TelemetryScreen> {
     try {
       final connector = Provider.of<MeshCoreConnector>(context, listen: false);
       final selection = await connector.preparePathForContactSend(
-        widget.contact,
+        _resolveContact(connector),
       );
       _pendingStatusSelection = selection;
       Uint8List frame;

lib/widgets/repeater_login_dialog.dart

@@ -69,11 +69,21 @@ class _RepeaterLoginDialogState extends State<RepeaterLoginDialog> {
 
   bool _isLoggingIn = false;
 
+  int _resolveRepeaterIndex = -1;
   Contact _resolveRepeater(MeshCoreConnector connector) {
-    return connector.contacts.firstWhere(
+    if (_resolveRepeaterIndex >= 0 &&
+        _resolveRepeaterIndex < connector.contacts.length &&
+        connector.contacts[_resolveRepeaterIndex].publicKeyHex ==
+            widget.repeater.publicKeyHex) {
+      return connector.contacts[_resolveRepeaterIndex];
+    }
+    _resolveRepeaterIndex = connector.contacts.indexWhere(
       (c) => c.publicKeyHex == widget.repeater.publicKeyHex,
-      orElse: () => widget.repeater,
     );
+    if (_resolveRepeaterIndex == -1) {
+      return widget.repeater;
+    }
+    return connector.contacts[_resolveRepeaterIndex];
   }
 
   Future<void> _handleLogin() async {

lib/widgets/room_login_dialog.dart

@@ -64,11 +64,22 @@ class _RoomLoginDialogState extends State<RoomLoginDialog> {
 
   bool _isLoggingIn = false;
 
+  int _resolveRepeaterIndex = -1;
+
   Contact _resolveRepeater(MeshCoreConnector connector) {
-    return connector.contacts.firstWhere(
+    if (_resolveRepeaterIndex >= 0 &&
+        _resolveRepeaterIndex < connector.contacts.length &&
+        connector.contacts[_resolveRepeaterIndex].publicKeyHex ==
+            widget.room.publicKeyHex) {
+      return connector.contacts[_resolveRepeaterIndex];
+    }
+    _resolveRepeaterIndex = connector.contacts.indexWhere(
       (c) => c.publicKeyHex == widget.room.publicKeyHex,
-      orElse: () => widget.room,
     );
+    if (_resolveRepeaterIndex == -1) {
+      return widget.room;
+    }
+    return connector.contacts[_resolveRepeaterIndex];
   }
 
   Future<void> _handleLogin() async {