feat: test menu dropdown, split text/media messages, target settings, provider URL links

- Replace 3 test buttons with unified dropdown menu (basic/periodic/scheduled/memory)
- Send text message first, then assets as reply (not combined caption+media)
- Pass all target config settings to Telegram client (disable_url_preview, max_media, chunk_delay, etc.)
- Real data test notifications for periodic/scheduled/memory (fetch from Immich)
- Provider card URL is now a clickable hyperlink
- Localized test type labels (EN/RU)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/lib/i18n/en.json

@@ -59,7 +59,11 @@
 		"oldestFirst": "Oldest first",
 		"loadingEvents": "Loading events...",
 		"asset": "asset",
-		"assets": "assets"
+		"assets": "assets",
+		"eventActivity": "Event Activity",
+		"last14days": "Last 14 days",
+		"events": "events",
+		"noChartData": "No event data yet"
 	},
 	"providers": {
 		"title": "Providers",
@@ -126,7 +130,11 @@
 		"batchDuration": "Batch duration (seconds)",
 		"linkedTargets": "targets",
 		"noLinkedTargets": "No targets linked. Add a target below.",
-		"addTarget": "Add target"
+		"addTarget": "Add target",
+		"testBasic": "Send test message",
+		"testPeriodic": "Test periodic summary",
+		"testScheduled": "Test scheduled assets",
+		"testMemory": "Test memory / On This Day"
 	},
 	"templates": {
 		"title": "Templates",

frontend/src/lib/i18n/ru.json

@@ -59,7 +59,11 @@
 		"oldestFirst": "Сначала старые",
 		"loadingEvents": "Загрузка событий...",
 		"asset": "файл",
-		"assets": "файлов"
+		"assets": "файлов",
+		"eventActivity": "Активность событий",
+		"last14days": "Последние 14 дней",
+		"events": "событий",
+		"noChartData": "Нет данных о событиях"
 	},
 	"providers": {
 		"title": "Провайдеры",
@@ -126,7 +130,11 @@
 		"batchDuration": "Длительность пакета (секунды)",
 		"linkedTargets": "получатели",
 		"noLinkedTargets": "Нет привязанных получателей. Добавьте получателя ниже.",
-		"addTarget": "Добавить получателя"
+		"addTarget": "Добавить получателя",
+		"testBasic": "Отправить тестовое сообщение",
+		"testPeriodic": "Тест периодической сводки",
+		"testScheduled": "Тест запланированных фото",
+		"testMemory": "Тест воспоминаний"
 	},
 	"templates": {
 		"title": "Шаблоны",