Update kjol website with C documentation

go/cmd/kjol-web/wasm/main.go

@@ -37,5 +37,17 @@ func main() {
 	// boot script put it there before the first paint — so this is not what makes the
 	// page dark; it is what makes the SWITCH know which way it is pointing, and what
 	// keeps the page following the OS if the user never touched the switch.
+	//
+	// The server rendered this button not knowing the theme (it cannot: the preference is
+	// in localStorage), so it drew the wrong icon. Init's signal write re-renders it, and
+	// the reconciler patches the one button. That mismatch is inherent, not a bug — it is
+	// the same reason the boot script has to exist at all.
+	//
+	// This line used to be unreachable: Hydrate ended in a `select {}` and never returned.
+	// See wasmruntime.Wait.
 	app.Theme.Init()
+
+	// Last line, always: a Go/wasm main that returns is a dead program, and every event
+	// handler on the page dies with it.
+	wasmruntime.Wait()
 }