refactor: use UserAgentClient for OSM API fetch, remove redundant comments

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

lib/screens/home_screen.dart

@@ -290,7 +290,6 @@ class _HomeScreenState extends State<HomeScreen> with TickerProviderStateMixin {
   }
 
   void _handleNodeDeepLink(OsmNode node) {
-    // Fly to node at zoom 16
     try {
       _mapController.animateTo(
         dest: node.coord,
@@ -302,7 +301,6 @@ class _HomeScreenState extends State<HomeScreen> with TickerProviderStateMixin {
       debugPrint('[HomeScreen] Could not animate to deep link node: $e');
     }
 
-    // Open the node details sheet after map animation settles
     Future.delayed(const Duration(milliseconds: 700), () {
       if (mounted) {
         openNodeTagSheet(node);

lib/services/deep_link_service.dart

@@ -2,12 +2,12 @@ import 'dart:async';
 import 'dart:convert';
 import 'package:app_links/app_links.dart';
 import 'package:flutter/material.dart';
-import 'package:http/http.dart' as http;
 import 'package:latlong2/latlong.dart';
 
 import '../models/node_profile.dart';
 import '../models/operator_profile.dart';
 import '../models/osm_node.dart';
+import 'http_client.dart';
 import 'profile_import_service.dart';
 import 'operator_profile_import_service.dart';
 import '../screens/profile_editor.dart';
@@ -107,7 +107,8 @@ class DeepLinkService {
   Future<OsmNode?> _fetchNodeById(int nodeId) async {
     try {
       final url = Uri.parse('https://api.openstreetmap.org/api/0.6/node/$nodeId.json');
-      final response = await http.get(url);
+      final client = UserAgentClient();
+      final response = await client.get(url);
       if (response.statusCode != 200) return null;
 
       final json = jsonDecode(response.body);