refactor(preferences): DataStore 설정 저장 안정성을 높인다

app/build.gradle

@@ -65,6 +65,7 @@ android {
         targetSdk 35
         versionCode 224
         versionName "1.51.1"
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
 
     buildTypes {
@@ -165,6 +166,7 @@ dependencies {
         exclude group: 'androidx.lifecycle', module: 'lifecycle-viewmodel'
         exclude group: 'androidx.lifecycle', module: 'lifecycle-viewmodel-ktx'
     }
+    implementation "androidx.datastore:datastore-preferences:1.2.0"
 
     // Gson
     implementation "com.google.code.gson:gson:2.13.2"
@@ -253,6 +255,10 @@ dependencies {
     testImplementation 'org.mockito:mockito-inline:5.2.0'
     testImplementation 'org.mockito.kotlin:mockito-kotlin:6.1.0'
     testImplementation 'io.mockk:mockk:1.14.6'
+
+    androidTestImplementation 'androidx.test:core-ktx:1.6.1'
+    androidTestImplementation 'androidx.test.ext:junit:1.2.1'
+    androidTestImplementation 'androidx.test:runner:1.6.2'
 }