Slidev: v0.48.0-beta.15 Release

   🚀 Features

• Improve note markers in overview  -  by @antfu <samp>(4b2f4)</samp>
• Allow preparsers to access the run mode (dev,export,build)  -  by @twitwi in https://github.com/slidevjs/slidev/issues/1337 <samp>(f5d80)</samp>

   🐞 Bug Fixes

• Use lz-string to compress and encode magic move steps, close #1338  -  by @antfu in https://github.com/slidevjs/slidev/issues/1338 <samp>(e1990)</samp>

   🏎 Performance

• Use lz-string to pass data more efficiently instead of js-base64. Remove unused deps  -  by @antfu <samp>(adf2a)</samp>

    View changes on GitHub