perf: shrink classes.dex from ~932KB to ~47KB (#26)

Drop the unused UI library dependencies (material, appcompat, core-ktx,
tracing) and replace the Material app theme with a zero-cost framework
theme. None of these were referenced by the source — they were pulled in
solely by the Material theme. This app is headless (instrumentation +
broadcast receiver, no activity), so a framework theme is sufficient.

classes.dex: 953,956 -> 47,700 bytes

Author: gmegidish

app/build.gradle.kts

@@ -56,10 +56,6 @@ android {
 
 dependencies {
 
-    implementation(libs.androidx.core.ktx)
-    implementation(libs.androidx.tracing)
-    implementation(libs.androidx.appcompat)
-    implementation(libs.material)
     implementation(libs.androidx.uiautomator) {
         exclude(group = "junit", module = "junit")
     }

app/src/main/res/values-night/themes.xml

@@ -1,16 +1,4 @@
-<resources xmlns:tools="http://schemas.android.com/tools">
-    <!-- Base application theme. -->
-    <style name="Theme.Mobilenextclipboard" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
-        <!-- Primary brand color. -->
-        <item name="colorPrimary">@color/purple_500</item>
-        <item name="colorPrimaryVariant">@color/purple_700</item>
-        <item name="colorOnPrimary">@color/white</item>
-        <!-- Secondary brand color. -->
-        <item name="colorSecondary">@color/teal_200</item>
-        <item name="colorSecondaryVariant">@color/teal_700</item>
-        <item name="colorOnSecondary">@color/black</item>
-        <!-- Status bar color. -->
-        <item name="android:statusBarColor">?attr/colorPrimaryVariant</item>
-        <!-- Customize your theme here. -->
-    </style>
-</resources>
+<resources>
+    <!-- Headless instrumentation app: no UI, so a zero-cost framework theme is enough. -->
+    <style name="Theme.Mobilenextclipboard" parent="@android:style/Theme.Material.Light.NoActionBar" />
+</resources>