feat: add sandboxBaseUrl config to resolve relative URLs in sandbox mode#7203

jmandel-via-jules wants to merge 7 commits intomermaid-js:developmermaid-js/mermaid:developfrom

jmandel-via-jules:claude/add-sandbox-base-url-01HHj4vFA3GQcUgPCsJdQe9Tjmandel-via-jules/mermaid:claude/add-sandbox-base-url-01HHj4vFA3GQcUgPCsJdQe9TCopy head branch name to clipboard