feat(home): expose extension country settings and isolate regional caches

lib/utils/extension_country_name.dart

@@ -0,0 +1,24 @@
+import 'package:flutter/widgets.dart';
+import 'package:spotiflac_android/l10n/l10n.dart';
+
+String extensionCountryName(BuildContext context, String code) {
+  final l10n = context.l10n;
+  return switch (code.toUpperCase()) {
+    'US' => l10n.regionCountryUS,
+    'GB' => l10n.regionCountryGB,
+    'FR' => l10n.regionCountryFR,
+    'DE' => l10n.regionCountryDE,
+    'IT' => l10n.regionCountryIT,
+    'ES' => l10n.regionCountryES,
+    'JP' => l10n.regionCountryJP,
+    'KR' => l10n.regionCountryKR,
+    'IN' => l10n.regionCountryIN,
+    'ID' => l10n.regionCountryID,
+    'BR' => l10n.regionCountryBR,
+    'MX' => l10n.regionCountryMX,
+    'AU' => l10n.regionCountryAU,
+    'CA' => l10n.regionCountryCA,
+    'XK' => l10n.regionCountryXK,
+    _ => code.toUpperCase(),
+  };
+}