Refactor BufferedImage logic with WebGL support, update DisplayView for GPU-based rendering, transition timing functions to Double, optimize MTMCClock frame logic, and add dynamic control for update state in ControlView.

src/jvmMain/kotlin/mtmc/util/PlatformSpecific.jvm.kt

@@ -1,6 +1,6 @@
 package mtmc.util
 
-actual fun currentTimeMillis(): Long = System.currentTimeMillis()
+actual fun currentTimeMillis(): Double = System.currentTimeMillis().toDouble()
 actual fun requestAnimationFrame(action: (Double) -> Unit) {
   error("requestAnimationFrame is not supported on JVM")
 }