Fix exports of package to allow including in node module project

[susnux]

• Resolves: Crashes in ESM SSR: Cannot use import statement outside a module #896

Currently the package can not be imported in a type="module" node project (ESM) because the floating-vue package has no type set, so it is a commonjs project. Therefor all .js files are interpreted as commonjs and importing fails with:

SyntaxError: Named export 'Dropdown' not found. The requested module 'floating-vue' is a CommonJS module, which may not support all module.exports as named exports.
CommonJS modules can always be imported via the default export, for example using:

This is fixed by changing the file extension for ESM files and using correct package exports instead of never officially supported module entry point.

[susnux]

replaced by #937