fix navbar freezing fix

lib/components/pages/new_entry/new_entry.dart

@@ -4,6 +4,7 @@ import 'dart:convert';
 import 'package:collection/collection.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
+import 'package:go_router/go_router.dart';
 import 'package:intl/intl.dart';
 import 'package:mileograph_flutter/components/calculator/calculator.dart';
 import 'package:mileograph_flutter/components/pages/traction.dart';

lib/components/pages/new_entry/new_entry_page.dart

@@ -10,6 +10,7 @@ class NewEntryPage extends StatefulWidget {
 }
 
 class _NewEntryPageState extends State<NewEntryPage> {
+  late final NavigationGuardCallback _exitGuard;
   final _formKey = GlobalKey<FormState>();
   DateTime _selectedDate = DateTime.now();
   TimeOfDay _selectedTime = TimeOfDay.now();
@@ -40,7 +41,8 @@ class _NewEntryPageState extends State<NewEntryPage> {
   @override
   void initState() {
     super.initState();
-    NavigationGuard.register(_handleExitIntent);
+    _exitGuard = _handleExitIntent;
+    NavigationGuard.register(_exitGuard);
     // legacy single-draft auto-save listeners removed in favor of explicit multi-draft flow
     Future.microtask(() {
       if (!mounted) return;
@@ -58,7 +60,7 @@ class _NewEntryPageState extends State<NewEntryPage> {
 
   @override
   void dispose() {
-    NavigationGuard.unregister(_handleExitIntent);
+    NavigationGuard.unregister(_exitGuard);
     _startController.dispose();
     _endController.dispose();
     _headcodeController.dispose();
@@ -586,7 +588,12 @@ class _NewEntryPageState extends State<NewEntryPage> {
         if (didPop) return;
         final allow = await _handleExitIntent();
         if (allow && context.mounted) {
-          Navigator.of(context).maybePop();
+          final router = GoRouter.of(context);
+          if (router.canPop()) {
+            context.pop();
+          } else {
+            context.go('/');
+          }
         }
       },
       child: Scaffold(
@@ -597,7 +604,12 @@ class _NewEntryPageState extends State<NewEntryPage> {
                   onPressed: () async {
                     if (!await _handleExitIntent()) return;
                     if (!context.mounted) return;
-                    Navigator.of(context).maybePop();
+                    final router = GoRouter.of(context);
+                    if (router.canPop()) {
+                      context.pop();
+                    } else {
+                      context.go('/');
+                    }
                   },
                 ),
                 title: const Text('Edit entry'),