E0312: Two islands share a name

An island's name is its Go type's name, and the page finds its component by it, so two @ui.Island types in the module can't share one, even in different packages.

Wrong

// modules/sales/chart.vuka
@ui.Island
type Chart struct{ … }

// modules/stock/chart.vuka
@ui.Island
type Chart struct{ … }

Right

@ui.Island
type SalesChart struct{ … }

@ui.Island
type StockChart struct{ … }