Add Android Auto MediaBrowserService to enable app discovery

[Copilot]

App doesn't appear in Android Auto because it lacks the required MediaBrowserService that Android Auto uses for app discovery.

Changes

• Added MediaBrowserService implementation (VoiceNotesMediaBrowserService.kt)

  • Implements minimal service required for Android Auto discovery
  • Validates client packages against trusted Android Auto package names
  • Returns empty media list since app is voice notes, not media playback

• Added automotive descriptor (res/xml/automotive_app_desc.xml)

  • Declares "media" category usage for Android Auto

• Updated AndroidManifest.xml

  • Declared MediaBrowserService with android.media.browse.MediaBrowserService intent filter
  • Added automotive metadata reference
  • Added android.hardware.type.automotive feature (not required)

• Added dependency (build.gradle)

  • androidx.media:media:1.7.0 for MediaBrowserServiceCompat

override fun onGetRoot(clientPackageName: String, clientUid: Int, rootHints: Bundle?): BrowserRoot? {
    return if (ALLOWED_PACKAGES.contains(clientPackageName)) {
        BrowserRoot(ROOT_ID, null)
    } else {
        null  // Reject untrusted clients
    }
}

App will now appear in Android Auto's app list when phone is connected to a car.

Original prompt

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This section details on the original issue you should resolve

<issue_title>App not displayed in Android Auto</issue_title>
<issue_description>I connected the phone to my car, clicked on the apps button, and didn't see it.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes App not displayed in Android Auto #16

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