fix(cache): use app-private image cache

lib/main.dart

@@ -287,10 +287,17 @@ FutureOr<SentryEvent?> _beforeSend(SentryEvent event, Hint _) {
   if (exceptions != null) {
     bool shouldDrop(SentryException e) {
       final v = e.value;
+      final lowerValue = v?.toLowerCase();
       // Windows file-lock errors from cache manager cleanup
       if (e.type == 'FileSystemException' && v != null && v.contains('plexImageCache') && v.contains('errno = 32')) {
         return true;
       }
+      if (e.type == 'FileSystemException' &&
+          lowerValue != null &&
+          lowerValue.contains('cached_network_image_ce') &&
+          (lowerValue.contains('lock failed') || lowerValue.contains('writefrom failed'))) {
+        return true;
+      }
       // Linux without DBus/NetworkManager
       if (e.type == 'DBusServiceUnknownException' || (v != null && v.contains('system_bus_socket'))) {
         return true;

lib/services/image_cache_service.dart

@@ -5,6 +5,7 @@ import 'dart:async';
 // ignore: implementation_imports
 import 'package:cached_network_image_ce/src/cache/default_cache_manager.dart' as ce_cache;
 import 'package:http/http.dart' as http;
+import 'package:path_provider/path_provider.dart';
 
 import '../utils/media_server_http_client.dart';
 
@@ -31,6 +32,7 @@ class PlexImageCacheManager extends ce_cache.DefaultCacheManager {
         stalePeriod: const Duration(days: 14),
         maxNrOfCacheObjects: 3000,
         httpClientFactory: () => _SharedHttpClient(_artworkHttpClient.inner),
+        cacheDirectoryProvider: getApplicationCacheDirectory,
       );
 }