feat: added companion app for WearOS, and setted up icons

mobile/src/main/java/ru/omni_devel/cards/MainActivity.kt

@@ -7,11 +7,13 @@ import android.widget.Button
 import android.widget.LinearLayout
 import android.widget.PopupMenu
 import android.widget.TextView
+import android.widget.Toast
 import androidx.activity.enableEdgeToEdge
 import androidx.appcompat.app.AppCompatActivity
 import androidx.core.view.ViewCompat
 import androidx.core.view.WindowInsetsCompat
 import com.google.android.material.button.MaterialButton
+import kotlinx.serialization.json.Json
 import org.w3c.dom.Text
 
 class MainActivity : AppCompatActivity() {
@@ -32,9 +34,23 @@ class MainActivity : AppCompatActivity() {
         cardsList = findViewById(R.id.cardsList)
 
         val addCardButton: Button = findViewById(R.id.addCardButton)
+        val syncWithWearOSButton: Button = findViewById(R.id.syncWithWearOSButton)
+
         addCardButton.setOnClickListener {
             startActivity(Intent(this, AddCardActivity::class.java))
         }
+
+        syncWithWearOSButton.setOnClickListener {
+            Toast.makeText(this, "Sync in progress...", Toast.LENGTH_SHORT).show()
+
+            val isSuccess = sendToWatch(this, "/updateCards", Json.encodeToString(db.getCards()))
+
+            if (isSuccess) {
+                Toast.makeText(this, "Synced!", Toast.LENGTH_SHORT).show()
+            } else {
+                Toast.makeText(this, "Sync failed! Please, check your connection", Toast.LENGTH_LONG).show()
+            }
+        }
     }
 
     override fun onResume() {