Add bdbai.base64-converter to gallery

[包布丁 (bdbai)]

Extension Submission

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Checklist

• My folder follows the <author>/<extension-name> convention (lowercase, alphanumeric + hyphens only)
• I have added an extension.json with all required fields
• The id field in my extension.json matches my folder path (author.extension-name)
• I have added an icon file (PNG or JPG, under 100 KB)
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• My extension is available at the install source I specified (winget/MS Store/URL)
• I have read the Contributing Guide

Additional context

Simple base64 conversion, with URL-safe variant support.

[Niels Laute (niels9001)]

Looks like the file is 103kb (we have a max 100kb limit). Can you make it a few % smaller?

Other than that, submission looks great!

[Niels Laute (niels9001)]

LGTM!