Prototype Compose Web for kandy-echarts using Kotlin/WASM

To explore the possibility of running echarts through Kotlin/WASM and embedding the resulting canvas into Compose Web.

Next Steps: Develop a basic prototype that demonstrates echarts running on Kotlin/WASM and integrated into a Compose Web interface.

Start by locating the kandy-echarts area and the existing Kotlin/WASM and Compose Web entry points. Define the smallest prototype that runs echarts through Kotlin/WASM and embeds its canvas in a Compose Web interface; done means that demonstration works end to end.

Written by the indexing model from the issue text.