Add Samsung Game Hub support, GAME category, optional NFC, and minor cleanup

src/android/app/src/main/AndroidManifest.xml

@@ -1,22 +1,22 @@
 <?xml version="1.0" encoding="utf-8"?>
-
+<!-- SPDX-FileCopyrightText: 2023 yuzu Emulator Project
-<!--
+     SPDX-License-Identifier: GPL-3.0-or-later -->
-SPDX-FileCopyrightText: 2023 yuzu Emulator Project
-SPDX-License-Identifier: GPL-3.0-or-later
--->
-
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
     <uses-feature android:name="android.hardware.touchscreen" android:required="false" />
     <uses-feature android:name="android.hardware.gamepad" android:required="false" />
     <uses-feature android:name="android.software.leanback" android:required="false" />
     <uses-feature android:name="android.hardware.vulkan.version" android:version="0x401000" android:required="true" />
 
+    <!-- Required Permissions for the app -->
     <uses-permission android:name="android.permission.INTERNET" />
-    <uses-permission android:name="android.permission.NFC" />
     <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
     <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
     <uses-permission android:name="android.permission.VIBRATE" />
 
+    <!-- Permissions for NFC (only if needed) -->
+    <uses-permission android:name="android.permission.NFC" android:required="false" />
+
     <application
         android:name="org.citron.citron_emu.CitronApplication"
         android:label="@string/app_name_suffixed"
@@ -31,28 +31,37 @@ SPDX-License-Identifier: GPL-3.0-or-later
         android:dataExtractionRules="@xml/data_extraction_rules_api_31"
         android:enableOnBackInvokedCallback="true">
 
-        <meta-data android:name="android.game_mode_config"
+        <!-- Samsung Gaming Hub specific metadata -->
+        <meta-data
+            android:name="com.samsung.android.gamehub"
+            android:value="true" />
+
+        <!-- Game Mode configuration -->
+        <meta-data
+            android:name="android.game_mode_config"
             android:resource="@xml/game_mode_config" />
 
+        <!-- Main Activity -->
         <activity
             android:name="org.citron.citron_emu.ui.main.MainActivity"
             android:exported="true"
             android:theme="@style/Theme.Citron.Splash.Main">
-
-            <!-- This intentfilter marks this Activity as the one that gets launched from Home screen. -->
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
-
                 <category android:name="android.intent.category.LAUNCHER" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.GAME" />
                 <category android:name="android.intent.category.LEANBACK_LAUNCHER" />
             </intent-filter>
         </activity>
 
+        <!-- Settings Activity -->
         <activity
             android:name="org.citron.citron_emu.features.settings.ui.SettingsActivity"
             android:theme="@style/Theme.Citron.Main"
             android:label="@string/preferences_settings" />
 
+        <!-- Emulation Activity -->
         <activity
             android:name="org.citron.citron_emu.activities.EmulationActivity"
             android:theme="@style/Theme.Citron.Main"
@@ -80,6 +89,7 @@ SPDX-License-Identifier: GPL-3.0-or-later
                 android:resource="@xml/nfc_tech_filter" />
         </activity>
 
+        <!-- Document Provider -->
         <provider
             android:name=".features.DocumentProvider"
             android:authorities="${applicationId}.user"