Update speaker sample

[kul3r4]

Update speaker sample to Compose 1.6 and fix screenshots tests

[gemini-code-assist]

Code Review

This pull request migrates the navigation in both the DataLayer Wearable app and the WearSpeakerSample app to the new Navigation 3 API, introducing Kotlin serialization for navigation keys. It also updates several dependencies and replaces Horologist's responsive column padding with minimumVerticalContentPadding on list items. Feedback is provided regarding the incorrect usage of minimumVerticalContentPadding on a non-interactive Text element in WearApp.kt, and the use of the deprecated RuntimeEnvironment.getApplication() in SpeakerPlayerScreenTest.kt which should be replaced with ApplicationProvider.getApplicationContext().

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DataLayer/Wearable/src/main/java/com/example/android/wearable/datalayer/WearApp.kt (186-190)

Applying minimumVerticalContentPadding (with ButtonDefaults.minimumVerticalListContentPadding) to a non-interactive Text element is semantically incorrect. This modifier is designed to ensure interactive elements meet minimum touch target requirements (typically 48dp) on Wear OS. For static text, standard padding or spacers should be used instead to control spacing, or the modifier can be removed entirely if no extra padding is needed.

                        modifier = Modifier.fillMaxWidth(),

WearSpeakerSample/wear/src/test/java/com/example/android/wearable/speaker/SpeakerPlayerScreenTest.kt (59)

Using RuntimeEnvironment.getApplication() is deprecated in Robolectric. It is recommended to use ApplicationProvider.getApplicationContext() from androidx.test.core.app instead to obtain the context in a modern and compatible way.

        val context = androidx.test.core.app.ApplicationProvider.getApplicationContext<android.content.Context>()
        val vibrator = context.getSystemService(android.content.Context.VIBRATOR_SERVICE) as android.os.Vibrator