Refactor test-app: remove unused build scripts and migrate components, utilities, and database files to vst-ui-base. Update SVG utilities with viewBox fix, enhance KnobComponent with global mouse listeners, and clean up unused imports.

settings.common.gradle.kts

@@ -0,0 +1,12 @@
+pluginManagement {
+  plugins {
+    kotlin("multiplatform") version "2.3.0"
+    id("org.jetbrains.dokka") version "2.0.0"
+    id("com.vanniktech.maven.publish") version "0.31.0"
+  }
+  repositories {
+    gradlePluginPortal()
+    mavenCentral()
+    maven { setUrl("https://plugins.gradle.org/m2/") }
+  }
+}