feat: complete production backend integration

tests/handler_test.php

@@ -76,3 +76,39 @@ test('rule form uses native period selector in da mode', function (): void {
     assert_contains('Rano', $html);
     assert_false(strpos($html, 'type="time"') !== false);
 });
+
+test('mutating handlers synchronize active backend after storage changes', function (): void {
+    foreach (['create.php', 'update.php', 'delete.php', 'toggle.php'] as $handler) {
+        $source = file_get_contents(PLUGIN_ROOT . '/exec/handlers/' . $handler) ?: '';
+        assert_contains('syncActiveBackend', $source, $handler . ' must synchronize backend after mutation');
+    }
+});
+
+test('calendar picker is based on selected rule month and supports month navigation', function (): void {
+    $settingsPath = TEST_TMP . '/form-calendar.conf';
+    test_write($settingsPath, "DEFAULT_PLUGIN_LANGUAGE=pl\nGLOBAL_AUTORESPONDER_BACKEND=exim\n");
+    $settings = Settings::load($settingsPath);
+    $ctx = new AppContext(
+        new DirectAdminUser('alice', 'enhanced', 'pl', TEST_TMP . '/config'),
+        $settings,
+        new RuleRepository(TEST_TMP . '/data'),
+        new CsrfGuard('secret', 'alice', 'sid'),
+        Lang::load('pl', $settings),
+        new AuditLog(TEST_TMP . '/audit.log')
+    );
+
+    $html = render_rule_form($ctx, 'update', [
+        'id' => 'abc',
+        'subject' => 'Urlop',
+        'body' => 'Body',
+        'enabled' => true,
+        'start_value' => '2027-02-14T20:00',
+        'end_value' => '2027-03-01T09:30',
+    ]);
+
+    assert_contains('data-calendar-picker', $html);
+    assert_contains('data-calendar-prev', $html);
+    assert_contains('data-calendar-next', $html);
+    assert_contains('Luty 2027', $html);
+    assert_false(strpos($html, 'Czerwiec 2026') !== false);
+});