fix: no 'uncategorized' category in categories page

src/content/posts/_schemas.ts

@@ -5,8 +5,8 @@ export const posts = ({ image }) => z.object({
   description: z.string(),
   pubDate: z.coerce.date(),
   updatedDate: z.coerce.date().optional(),
-  categories: z.array(z.string()).optional().default(['uncategorized']),
-  tags: z.array(z.string()).optional().default([]),
+  categories: z.array(z.string()).default(['uncategorized']),
+  tags: z.array(z.string()).optional(),
   cover: image().optional(),
   author: z.string().optional(),
 });

src/content/posts/minimalism/index.md

@@ -7,6 +7,8 @@ tags:
   - 'design'
   - 'code' 
   - 'minimalism'
+categories:
+  - 'thinking'
 ---
 
 Minimalism isn't just about having less, it's about making room for what matters.