handle string tags

content/showcase.md

@@ -16,4 +16,4 @@ Want to see what Quartz can do? Here are some cool community gardens :)
 - [Abhijeet's Math Wiki](https://abhmul.github.io/quartz/Math-Wiki/)
 - [Mike's AI Garden 🤖🪴](https://mwalton.me/)
 
-If you want to see your own on here, submit a [Pull Request adding yourself to this file](https://github.com/jackyzha0/quartz/blob/v4-alpha/content/showcase.md)!
+If you want to see your own on here, submit a [Pull Request adding yourself to this file](https://github.com/jackyzha0/quartz/blob/v4-alpha/content/showcase.md)!

quartz/plugins/transformers/frontmatter.ts

@@ -23,6 +23,10 @@ export const FrontMatter: QuartzTransformerPlugin<Partial<Options> | undefined>
           return (_, file) => {
             const { data } = matter(file.value, opts)
 
+            if (typeof data.tags === 'string') {
+              data.tags = data.tags.split(" ")
+            }
+
             // fill in frontmatter
             file.data.frontmatter = {
               title: file.stem ?? "Untitled",