Upgrade Kotlin to 2.3.0, refine MainView, and update dependencies

Updated Kotlin Multiplatform to 2.3.0 for enhanced compatibility and improvements. Streamlined `MainView` with cleaner structure, added responsive scaling, and introduced a `HiddenCss` class. Upgraded various dependencies, including `vst-ui-base` to 2.2.3 and `midi-arrays` to 0.3.6, ensuring better functionality and consistency. Added changes to build task configurations for improved build pipelines.

.run/Main [jvm].run.xml

@@ -17,11 +17,11 @@
         </ExternalSystemSettings>
         <ExternalSystemDebugServerProcess>false</ExternalSystemDebugServerProcess>
         <ExternalSystemReattachDebugProcess>true</ExternalSystemReattachDebugProcess>
+        <ExternalSystemDebugDisabled>false</ExternalSystemDebugDisabled>
         <DebugAllEnabled>false</DebugAllEnabled>
         <RunAsTest>false</RunAsTest>
-        <method v="2">
-            <option name="Gradle.BeforeRunTask" enabled="true" tasks="clean build" externalProjectPath="$PROJECT_DIR$"
-                    vmOptions="" scriptParameters=""/>
-        </method>
+        <GradleProfilingDisabled>false</GradleProfilingDisabled>
+        <GradleCoverageDisabled>false</GradleCoverageDisabled>
+        <method v="2"/>
     </configuration>
 </component>