fix: API compatibility and leanback requirement

- Replace resources.getColor(id, null) with ContextCompat.getColor() for API 21-22 compatibility
- Change android.software.leanback to required=false to allow testing on non-TV emulators

app/src/main/java/com/videoapp/tv/PlayerActivity.kt

@@ -7,6 +7,7 @@ import android.webkit.WebView
 import android.webkit.WebViewClient
 import android.widget.Button
 import androidx.appcompat.app.AppCompatActivity
+import androidx.core.content.ContextCompat
 import androidx.lifecycle.lifecycleScope
 import androidx.media3.common.MediaItem
 import androidx.media3.exoplayer.ExoPlayer
@@ -93,7 +94,7 @@ class PlayerActivity : AppCompatActivity() {
             val btn = Button(this).apply {
                 text = ep.title
                 setBackgroundResource(R.drawable.episode_selector)
-                setTextColor(resources.getColor(R.color.text_primary, null))
+                setTextColor(ContextCompat.getColor(this@PlayerActivity, R.color.text_primary))
                 textSize = 13f
                 minWidth = 0
                 setPadding(16, 8, 16, 8)