Rename package com.eddy.atomrelay -> nl.eddydevink.sylda, Dutch translations, UI cleanup

- Package renamed to nl.eddydevink.sylda (matches eddydevink.nl domain + Sylda app name)
- All status texts translated to Dutch (Niet verbonden, Verbonden, Zoeken, etc.)
- Removed exchange key button, build number, and success toasts
- Button text: Firmware bijwerken, instruction text shortened
- App title changed to Sylda, 'instellingen' label next to settings gear
- ON/HOLD changed to AAN/VAST

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

@@ -4,14 +4,28 @@
     android:layout_height="match_parent"
     android:padding="16dp">
 
-    <ImageButton
-        android:id="@+id/settingsButton"
-        android:layout_width="48dp"
-        android:layout_height="48dp"
+    <LinearLayout
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
         android:layout_gravity="end|top"
-        android:src="@drawable/ic_settings"
-        android:background="?android:attr/selectableItemBackgroundBorderless"
-        android:contentDescription="@string/cd_settings" />
+        android:orientation="horizontal"
+        android:gravity="center_vertical">
+
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/settings_label"
+            android:textSize="14sp"
+            android:layout_marginEnd="4dp" />
+
+        <ImageButton
+            android:id="@+id/settingsButton"
+            android:layout_width="40dp"
+            android:layout_height="40dp"
+            android:src="@drawable/ic_settings"
+            android:background="?android:attr/selectableItemBackgroundBorderless"
+            android:contentDescription="@string/cd_settings" />
+    </LinearLayout>
 
     <LinearLayout
         android:layout_width="wrap_content"