Add support for Android TV and update dependencies

*   Implement initial Android TV support, including `LEANBACK_LAUNCHER` intent filter, hardware feature declarations, and television-specific layouts for the player, search results, and dialogs.
*   Add a splash/loading screen for the TV interface and a dedicated `SplashTheme`.
*   Improve DPAD navigation by adding `OnKeyListener` for station cards and allowing focus on internal elements.
*   Update `LayoutHolder` and `PlayerFragment` to handle TV layouts and add previous/next station navigation buttons.
*   Adjust `PreferencesHelper` to disable station editing by default on TV devices.
*   Update `androidx.media3` to v1.10.0, `work-runtime-ktx` to v2.11.2, and add `androidx.leanback` dependency.
*   Bump `versionCode` to 144 and `versionName` to 14.4.
*   Refactor `PlayerService` to simplify sleep timer cancellation logic.
*   Remove stale copyright headers and license comments from several Kotlin files.

app/src/main/res/drawable/selector_card_station_background.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="@color/search_result_background_selected" android:state_focused="true" />
+    <item android:drawable="@android:color/transparent" />
+</selector>

app/src/main/res/drawable/selector_card_station_stroke.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:color="@color/list_card_stroke_focused" android:state_focused="true" />
+    <item android:color="@color/list_card_stroke_background" />
+</selector>

app/src/main/res/drawable/selector_generic_button_focus.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:state_focused="true">
+        <shape android:shape="rectangle">
+            <solid android:color="#80FFFFFF" />
+            <corners android:radius="8dp" />
+            <stroke android:width="3dp" android:color="@color/default_neutral_white" />
+        </shape>
+    </item>
+    <item android:drawable="@android:color/transparent" />
+</selector>

app/src/main/res/drawable/selector_search_result_item.xml

@@ -1,8 +1,9 @@
 <?xml version="1.0" encoding="utf-8"?>
 <selector xmlns:android="http://schemas.android.com/apk/res/android">
 
-    <!-- View is "selected" -->
+    <!-- View is "selected" or "focused" (for TV) -->
     <item android:drawable="@drawable/shape_search_result_item_selected" android:state_selected="true" />
+    <item android:drawable="@drawable/shape_search_result_item_selected" android:state_focused="true" />
 
     <!-- Default state. -->
     <item android:drawable="@drawable/shape_search_result_item" />

app/src/main/res/drawable/shape_player_button_small_selected.xml

@@ -1,8 +1,8 @@
 <shape xmlns:android="http://schemas.android.com/apk/res/android"
     android:shape="oval">
     <stroke
-        android:width="2dp"
-        android:color="@color/default_neutral_lighter" />
+        android:width="4dp"
+        android:color="@color/default_neutral_white" />
     <size
         android:width="56dp"
         android:height="56dp" />

app/src/main/res/drawable/splash_screen.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="@color/splashBackgroundColor" />
+    <item
+        android:width="160dp"
+        android:height="160dp"
+        android:gravity="center">
+        <bitmap
+            android:gravity="center"
+            android:src="@mipmap/ic_launcher" />
+    </item>
+</layer-list>