Update metadata and enhance image export functionality: Adjust compatible version and improve image handling in export process.

metadata.json

@@ -5,6 +5,6 @@
 	"version": "1.0.0",
 	"releaseDate": "2026-06-01",
 	"license": "MIT",
-	"compatible": "3.20",
+	"compatible": "3.22.0",
 	"notes": "Export Bludit articles to a GitHub repository as Markdown files with YAML frontmatter."
 }