Add interactive tutorial system for calibration and device cards

Generic tutorial engine supports absolute (modal) and fixed (viewport)
positioning modes with spotlight backdrop, pulsing ring, and tooltip.
Calibration tutorial covers LED count, corner, direction, offset, span,
test, and toggle inputs. Device tutorial walks through card controls.
Auto-triggers on first calibration open and first device add.

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

server/src/wled_controller/static/locales/en.json

@@ -77,6 +77,14 @@
   "device.health.online": "WLED Online",
   "device.health.offline": "WLED Offline",
   "device.health.checking": "Checking...",
+  "device.tutorial.start": "Start tutorial",
+  "device.tip.metadata": "Device info (LED count, type, color channels) is auto-detected from WLED",
+  "device.tip.brightness": "Slide to adjust device brightness",
+  "device.tip.start": "Start or stop screen capture processing",
+  "device.tip.settings": "Configure device settings (display, FPS, health check)",
+  "device.tip.calibrate": "Calibrate LED positions, direction, and coverage",
+  "device.tip.webui": "Open WLED's built-in web interface for advanced configuration",
+  "device.tip.add": "Click here to add a new WLED device",
   "settings.title": "Device Settings",
   "settings.brightness": "Brightness:",
   "settings.brightness.hint": "Global brightness for this WLED device (0-100%)",
@@ -92,9 +100,12 @@
   "calibration.title": "LED Calibration",
   "calibration.tip.led_count": "Enter LED count per edge",
   "calibration.tip.start_corner": "Click a corner to set the start position",
+  "calibration.tip.direction": "Toggle LED strip direction (clockwise / counterclockwise)",
+  "calibration.tip.offset": "Set LED offset — distance from LED 0 to the start corner",
   "calibration.tip.span": "Drag green bars to adjust coverage span",
   "calibration.tip.test": "Click an edge to toggle test LEDs",
   "calibration.tip.toggle_inputs": "Click total LED count to toggle edge inputs",
+  "calibration.tutorial.start": "Start tutorial",
   "calibration.start_position": "Starting Position:",
   "calibration.position.bottom_left": "Bottom Left",
   "calibration.position.bottom_right": "Bottom Right",

server/src/wled_controller/static/locales/ru.json

@@ -77,6 +77,14 @@
   "device.health.online": "WLED Онлайн",
   "device.health.offline": "WLED Недоступен",
   "device.health.checking": "Проверка...",
+  "device.tutorial.start": "Начать обучение",
+  "device.tip.metadata": "Информация об устройстве (кол-во LED, тип, цветовые каналы) определяется автоматически из WLED",
+  "device.tip.brightness": "Перетащите для регулировки яркости",
+  "device.tip.start": "Запуск или остановка захвата экрана",
+  "device.tip.settings": "Настройки устройства (дисплей, FPS, интервал проверки)",
+  "device.tip.calibrate": "Калибровка позиций LED, направления и зоны покрытия",
+  "device.tip.webui": "Открыть встроенный веб-интерфейс WLED для расширенной настройки",
+  "device.tip.add": "Нажмите, чтобы добавить новое WLED устройство",
   "settings.title": "Настройки Устройства",
   "settings.brightness": "Яркость:",
   "settings.brightness.hint": "Общая яркость для этого WLED устройства (0-100%)",
@@ -92,9 +100,12 @@
   "calibration.title": "Калибровка Светодиодов",
   "calibration.tip.led_count": "Укажите количество LED на каждой стороне",
   "calibration.tip.start_corner": "Нажмите на угол для выбора стартовой позиции",
+  "calibration.tip.direction": "Переключение направления ленты (по часовой / против часовой)",
+  "calibration.tip.offset": "Смещение LED — расстояние от LED 0 до стартового угла",
   "calibration.tip.span": "Перетащите зелёные полосы для настройки зоны покрытия",
   "calibration.tip.test": "Нажмите на край для теста LED",
   "calibration.tip.toggle_inputs": "Нажмите на общее количество LED для скрытия боковых полей",
+  "calibration.tutorial.start": "Начать обучение",
   "calibration.start_position": "Начальная Позиция:",
   "calibration.position.bottom_left": "Нижний Левый",
   "calibration.position.bottom_right": "Нижний Правый",