fix: get the app building

- settings.gradle.kts: add dependencyResolutionManagement repositories so app deps resolve
- activity_main.xml: move help text with raw quotes to a string resource (commands_help)
- RingService.kt: import NotificationChannel and PendingIntent
- gradle wrapper: add gradlew + gradle-wrapper.jar, regenerate properties
- add .gitignore for build outputs and local.properties

app/src/main/java/com/example/lostmyphone/RingService.kt

@@ -1,6 +1,8 @@
 package com.example.lostmyphone
 
+import android.app.NotificationChannel
 import android.app.NotificationManager
+import android.app.PendingIntent
 import android.app.Service
 import androidx.core.app.NotificationCompat
 import android.content.ContentUris

app/src/main/res/layout/activity_main.xml

@@ -88,7 +88,7 @@
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:layout_marginTop="24dp"
-            android:text="Commands: send \"RING_NOW\" to this device for the default ringtone, or \"PLAY_SONG <Name>\" to play a matching local track."
+            android:text="@string/commands_help"
             android:textSize="13sp" />
 
     </LinearLayout>

app/src/main/res/values/strings.xml

@@ -29,4 +29,6 @@
 
     <string name="status_help">Status: %1$s</string>
     <string name="dnd_explanation">Enabling Do Not Disturb Access lets the app cut through DND to play the ring. It is only ever used after a valid SMS trigger or a manual test.</string>
+
+    <string name="commands_help">Commands: send "RING_NOW" to this device for the default ringtone, or "PLAY_SONG &lt;Name&gt;" to play a matching local track.</string>
 </resources>