fix: Handle GET_SAMPLE_TEXT as requested by AOSP Settings

[nchilada]

The Settings > Accessibility > Text-to-speech output > Play button confirms that TTS is working and helps the user modulate the Pitch and Speech Rate settings.

Because the Supertonic TTS engine wasn't handling the GET_SAMPLE_TEXT intent, the Play button was visible and tappable but didn't play any audio, not even the default sentence. Internally, startActivityForResult was repeatedly throwing an error and spamming the logs with:

E TextToSpeechSettings: Failed to get sample text, no activity found for Intent { act=android.speech.tts.engine.GET_SAMPLE_TEXT xflg=0x4 pkg=com.brahmadeo.supertonic.tts (has extras) })

Summary by CodeRabbit

• New Features
  • Added support for Android text-to-speech sample-text requests.
  • English-speaking systems now receive a sample sentence and an available-language response.

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between af3a8ee and 8065d5d.

📒 Files selected for processing (2)

• app/src/main/AndroidManifest.xml
• app/src/main/java/com/brahmadeo/supertonic/tts/GetSampleTextActivity.kt

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