Feat: Add 'Run an Example' button and trigger AgentService

This commit introduces a new button on the main screen that allows users to run an example task.

The "Run an Example" button is only visible when all the necessary permissions have been granted by the user. When clicked, it now starts the `AgentService` with the task "open youtube and play never gonna give you up", demonstrating the app's automation capabilities.

This replaces the previous implementation where the button would simply open a YouTube link directly.

Changes include:
- Added a new button to `app/src/main/res/layout/activity_main.xml`.
- Modified `app/src/main/java/com/blurr/voice/MainActivity.kt` to handle the button's visibility and to call `AgentService.start()` on click.

Author: google-labs-jules[bot]

app/src/main/java/com/blurr/voice/MainActivity.kt

@@ -35,6 +35,7 @@ import androidx.core.content.ContextCompat
 import androidx.core.net.toUri
 import androidx.core.graphics.toColorInt
 import androidx.lifecycle.lifecycleScope
+import com.blurr.voice.v2.AgentService
 import com.blurr.voice.services.EnhancedWakeWordService
 import com.blurr.voice.utilities.FreemiumManager
 import com.blurr.voice.utilities.OnboardingManager
@@ -331,9 +332,8 @@ class MainActivity : AppCompatActivity(), PaywallResultHandler {
             showDisclaimerDialog()
         }
         runExampleButton.setOnClickListener {
-            val youtubeUrl = "https://www.youtube.com/watch?v=dQw4w9WgXcQ"
-            val intent = Intent(Intent.ACTION_VIEW, Uri.parse(youtubeUrl))
-            startActivity(intent)
+            val task = "open youtube and play never gonna give you up"
+            AgentService.start(this, task)
         }
     }