Create a standalone executable or self-contained HTML.
When true, creates an executable for the current platform. When a target string, creates an executable for that platform.
When used with target: "browser", produces self-contained HTML files with all scripts, styles, and assets inlined. All <script> tags become inline <script> with bundled code, all <link rel="stylesheet"> tags become inline <style> tags, and all asset references become data: URIs. All entrypoints must be HTML files. Cannot be used with splitting.