feat: introduce Local Filters / Remote Filters terminology (#109)

- Rename 'Local email filters' → 'Local Filters' and 'Server email
  filters' → 'Remote Filters' in AppBar titles
- Update banner text on each filter page to focus on the current type
  and mention that the other type exists separately
- Add 'Remote Filters' and 'Local Filters' as two distinct drawer
  entries so both types are discoverable from the navigation
- Add widget tests verifying titles and banner text for both pages

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

lib/ui/screens/sieve_scripts_screen.dart

@@ -138,7 +138,7 @@ class _SieveScriptsScreenState extends ConsumerState<SieveScriptsScreen> {
     return Scaffold(
       appBar: AppBar(
         title: Text(
-          widget.isLocal ? 'Local email filters' : 'Server email filters',
+          widget.isLocal ? 'Local Filters' : 'Remote Filters',
         ),
       ),
       body: _buildBody(),
@@ -178,7 +178,7 @@ class _SieveScriptsScreenState extends ConsumerState<SieveScriptsScreen> {
         Expanded(
           child: scripts.isEmpty
               ? const Center(
-                  child: Text('No Sieve scripts. Tap + to create one.'),
+                  child: Text('No filters yet. Tap + to create one.'),
                 )
               : RefreshIndicator(
                   onRefresh: _load,
@@ -208,10 +208,11 @@ class _SieveSourceBanner extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final text = isLocal
-        ? 'These scripts run locally on this device. '
-            'Server email filters are separate and independent.'
-        : 'These scripts run on the mail server (ManageSieve / JMAP). '
-            'Local email filters are separate and independent.';
+        ? 'Local Filters run Sieve scripts directly on this device. '
+            'Remote Filters, which run on the mail server, are configured separately.'
+        : 'Remote Filters run Sieve scripts on the mail server '
+            '(ManageSieve or JMAP). '
+            'Local Filters, which run on this device, are configured separately.';
     return Container(
       width: double.infinity,
       color: Theme.of(context).colorScheme.surfaceContainerHighest,

lib/ui/widgets/folder_drawer.dart

@@ -70,13 +70,21 @@ class FolderDrawer extends ConsumerWidget {
             },
           ),
           ListTile(
-            leading: const Icon(Icons.filter_list),
-            title: const Text('Email filters'),
+            leading: const Icon(Icons.dns),
+            title: const Text('Remote Filters'),
             onTap: () {
               Navigator.pop(context);
               unawaited(context.push('/accounts/$accountId/sieve'));
             },
           ),
+          ListTile(
+            leading: const Icon(Icons.phone_android),
+            title: const Text('Local Filters'),
+            onTap: () {
+              Navigator.pop(context);
+              unawaited(context.push('/accounts/$accountId/sieve/local'));
+            },
+          ),
           const Divider(height: 1),
           Expanded(
             child: StreamBuilder(

test/widget/sieve_scripts_screen_test.dart

@@ -0,0 +1,76 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:http/http.dart' as http;
+import 'package:sharedinbox/core/models/sieve_script.dart';
+import 'package:sharedinbox/data/db/local_sieve_repository.dart';
+import 'package:sharedinbox/data/jmap/sieve_repository.dart';
+import 'package:sharedinbox/di.dart';
+import 'package:sharedinbox/ui/screens/sieve_scripts_screen.dart';
+
+import '../unit/db_test_helper.dart';
+import 'helpers.dart';
+
+class _FakeSieveRepository extends SieveRepository {
+  _FakeSieveRepository() : super(FakeAccountRepository(), http.Client());
+
+  @override
+  Future<List<SieveScript>> listScripts(String accountId) async => [];
+}
+
+void main() {
+  configureSqliteForTests();
+
+  testWidgets('Remote Filters page shows correct title and banner', (
+    tester,
+  ) async {
+    await tester.pumpWidget(
+      ProviderScope(
+        overrides: [
+          sieveRepositoryProvider.overrideWith(
+            (ref) => _FakeSieveRepository(),
+          ),
+        ],
+        child: const MaterialApp(
+          home: SieveScriptsScreen(accountId: 'acc-1'),
+        ),
+      ),
+    );
+    await tester.pumpAndSettle();
+
+    expect(find.text('Remote Filters'), findsOneWidget);
+    expect(
+      find.textContaining('Remote Filters run Sieve scripts'),
+      findsOneWidget,
+    );
+    expect(find.textContaining('Local Filters'), findsOneWidget);
+  });
+
+  testWidgets('Local Filters page shows correct title and banner', (
+    tester,
+  ) async {
+    final db = openTestDatabase();
+    addTearDown(db.close);
+
+    await tester.pumpWidget(
+      ProviderScope(
+        overrides: [
+          localSieveRepositoryProvider.overrideWith(
+            (ref) => LocalSieveRepository(db),
+          ),
+        ],
+        child: const MaterialApp(
+          home: SieveScriptsScreen(accountId: 'acc-1', isLocal: true),
+        ),
+      ),
+    );
+    await tester.pumpAndSettle();
+
+    expect(find.text('Local Filters'), findsOneWidget);
+    expect(
+      find.textContaining('Local Filters run Sieve scripts'),
+      findsOneWidget,
+    );
+    expect(find.textContaining('Remote Filters'), findsOneWidget);
+  });
+}