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

lib/widgets/home_feed_region_setting.dart

@@ -0,0 +1,87 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:spotiflac_android/l10n/l10n.dart';
+import 'package:spotiflac_android/providers/explore_provider.dart';
+import 'package:spotiflac_android/providers/extension_provider.dart';
+import 'package:spotiflac_android/utils/extension_country_name.dart';
+import 'package:spotiflac_android/widgets/app_bottom_sheet.dart';
+import 'package:spotiflac_android/widgets/app_snack_bar.dart';
+import 'package:spotiflac_android/widgets/settings_group.dart';
+
+class HomeFeedRegionSetting extends ConsumerStatefulWidget {
+  const HomeFeedRegionSetting({super.key});
+
+  @override
+  ConsumerState<HomeFeedRegionSetting> createState() =>
+      _HomeFeedRegionSettingState();
+}
+
+class _HomeFeedRegionSettingState extends ConsumerState<HomeFeedRegionSetting> {
+  bool _saving = false;
+
+  @override
+  Widget build(BuildContext context) {
+    final extension = ref.watch(homeFeedExtensionProvider);
+    final setting = extension?.homeFeedRegionSetting;
+    if (extension == null || setting == null) return const SizedBox.shrink();
+    final saved = ref.watch(extensionSettingsProvider(extension.id));
+    final selected = (saved.value?[setting.key] ?? setting.defaultValue)
+        ?.toString();
+    return SettingsItem(
+      icon: Icons.public,
+      title: context.l10n.extensionsHomeFeedCountry,
+      subtitle: saved.hasError
+          ? context.friendlyError(saved.error)
+          : '${extensionCountryName(context, selected ?? '')} · ${extension.displayName}',
+      showDivider: false,
+      onTap: _saving
+          ? null
+          : () async {
+              if (saved.hasError) {
+                ref.invalidate(extensionSettingsProvider(extension.id));
+                return;
+              }
+              final region = await showAppScrollableBottomSheet<String>(
+                context: context,
+                title: context.l10n.extensionsHomeFeedCountry,
+                subtitle:
+                    setting.description ??
+                    context.l10n.extensionsHomeFeedCountryDescription,
+                builder: (sheetContext, controller) => SingleChildScrollView(
+                  controller: controller,
+                  child: Column(
+                    mainAxisSize: MainAxisSize.min,
+                    children: [
+                      for (final code in setting.options!)
+                        AppSheetOption.choice(
+                          title: Text(extensionCountryName(sheetContext, code)),
+                          subtitle: Text(code.toUpperCase()),
+                          selected:
+                              code.toUpperCase() == selected?.toUpperCase(),
+                          onTap: () => Navigator.pop(sheetContext, code),
+                        ),
+                    ],
+                  ),
+                ),
+              );
+              if (!mounted || region == null) return;
+              setState(() => _saving = true);
+              final success = await ref
+                  .read(extensionProvider.notifier)
+                  .setHomeFeedRegion(extension.id, region);
+              if (!mounted || !context.mounted) return;
+              setState(() => _saving = false);
+              if (!success) {
+                showAppSnackBar(
+                  context,
+                  content: Text(
+                    context.l10n.snackbarError(
+                      context.friendlyError(ref.read(extensionProvider).error),
+                    ),
+                  ),
+                );
+              }
+            },
+    );
+  }
+}