feat(remote-control): add channel selection by number and volume control features

- Implemented `getChannelItemByNumber` utility function to retrieve channels by their number.
- Enhanced `StalkerLiveStreamLayoutComponent` and `LiveStreamLayoutComponent` to handle remote control commands for channel selection and volume adjustments.
- Updated typings to include new remote control commands and status updates.
- Refactored `RemoteControlComponent` to manage numeric input for channel selection and volume control actions.
- Improved UI for remote control with new volume and channel navigation features.
- Added service methods for volume up, down, and mute toggle in `RemoteControlService`.

apps/web/src/app/shared/services/remote-channel-navigation.util.ts

@@ -32,3 +32,26 @@ export function getAdjacentChannelItem<T>(
 
     return items[nextIndex] ?? null;
 }
+
+/**
+ * Returns the Nth item in a list (1-based index), or null if out of range.
+ */
+export function getChannelItemByNumber<T>(
+    items: T[],
+    channelNumber: number
+): T | null {
+    if (
+        !Array.isArray(items) ||
+        items.length === 0 ||
+        !Number.isFinite(channelNumber)
+    ) {
+        return null;
+    }
+
+    const index = Math.floor(channelNumber) - 1;
+    if (index < 0 || index >= items.length) {
+        return null;
+    }
+
+    return items[index] ?? null;
+}