Fix getVisualListRange to use GetStartOfNode like TypeScript

Changed getVisualListRange to use astnav.GetStartOfNode() instead of next.Pos()
to match TypeScript's getStart(sourceFile) behavior, which skips trivia.

This fixes the range calculation from (13, 13) to the correct value by properly
handling leading whitespace/trivia before the next token.

Based on analysis by @andrewbranch comparing against TypeScript reference
implementation in smartIndenter.ts.

Co-authored-by: andrewbranch <3277153+andrewbranch@users.noreply.github.com>

Author: Copilot

internal/format/indent.go

@@ -346,7 +346,7 @@ func getVisualListRange(node *ast.Node, list core.TextRange, sourceFile *ast.Sou
 	if next == nil {
 		nextStart = list.End()
 	} else {
-		nextStart = next.Pos()
+		nextStart = astnav.GetStartOfNode(next, sourceFile, false)
 	}
 	return core.NewTextRange(priorEnd, nextStart)
 }