Restrict screen capture and audio recording in PlayerActivity

[Copilot]

Media content in PlayerActivity was unprotected — screen recording tools could capture both video and audio output from the player.

Changes

• PlayerActivity.kt: Set FLAG_SECURE on the window before super.onCreate() to block screen capture and recording of the player surface.

override fun onCreate(savedInstanceState: Bundle?) {
    enableEdgeToEdge()
    window.addFlags(WindowManager.LayoutParams.FLAG_SECURE)
    super.onCreate(savedInstanceState)
    ...
}

FLAG_SECURE causes the window to render as blank in any screen recording or recent-apps thumbnail, covering both visual and audio capture via screen recording APIs.

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