feat(coding-agent): Export convertToPng for extensions

packages/coding-agent/src/index.ts

@@ -349,6 +349,7 @@ export {
 // Clipboard utilities
 export { copyToClipboard } from "./utils/clipboard.ts";
 export { parseFrontmatter, stripFrontmatter } from "./utils/frontmatter.ts";
+export { convertToPng } from "./utils/image-convert.ts";
 export { formatDimensionNote, type ResizedImage, resizeImage } from "./utils/image-resize.ts";
 // Shell utilities
 export { getShellConfig } from "./utils/shell.ts";