set up JavaFX architecture and playlist feature

pom.xml

@@ -11,7 +11,8 @@
 
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-<junit.version>5.10.2</junit.version>  </properties>
+    <junit.version>5.10.2</junit.version>
+  </properties>
 
   <dependencies>
     <dependency>
@@ -19,13 +20,20 @@
       <artifactId>javafx-controls</artifactId>
       <version>21</version>
     </dependency>
+
     <dependency>
       <groupId>org.openjfx</groupId>
       <artifactId>javafx-fxml</artifactId>
       <version>21</version>
     </dependency>
 
-<dependency>
+    <dependency>
+      <groupId>org.openjfx</groupId>
+      <artifactId>javafx-graphics</artifactId>
+      <version>21</version>
+    </dependency>
+
+    <dependency>
       <groupId>org.junit.jupiter</groupId>
       <artifactId>junit-jupiter-api</artifactId>
       <version>${junit.version}</version>
@@ -36,7 +44,8 @@
       <artifactId>junit-jupiter-engine</artifactId>
       <version>${junit.version}</version>
       <scope>test</scope>
-    </dependency>  </dependencies>
+    </dependency>
+  </dependencies>
 
   <build>
     <plugins>
@@ -49,16 +58,19 @@
           <target>23</target>
         </configuration>
       </plugin>
+
       <plugin>
         <groupId>org.openjfx</groupId>
         <artifactId>javafx-maven-plugin</artifactId>
         <version>0.0.8</version>
+        <configuration>
+          <mainClass>sbu.javafx.Launcher</mainClass>
+        </configuration>
         <executions>
           <execution>
-            <!-- Default configuration for running with: mvn clean javafx:run -->
             <id>default-cli</id>
             <configuration>
-              <mainClass>sbu.javafx/sbu.javafx.MusicApp</mainClass>
+              <mainClass>sbu.javafx.MusicApp</mainClass>
               <launcher>app</launcher>
               <jlinkZipName>app</jlinkZipName>
               <jlinkImageName>app</jlinkImageName>