v0:contracts(pkg):fix: update Blob MIME type to include charset in read handler and contract validation

Author: lumpinif

apps/workers/v0/src/routers/read/read.handler.ts

@@ -19,7 +19,7 @@ export const readGETHandler = authed
       );
 
       // WORKAROUND: Return a Blob with text/markdown MIME type to bypass ORPC's JSON serialization
-      return new Blob([result], { type: 'text/markdown' });
+      return new Blob([result], { type: 'text/markdown; charset=utf-8' });
     } catch (error) {
       const errorMessage =
         error instanceof Error ? error.message : 'Unknown error';

packages/contracts/src/read.ts

@@ -29,8 +29,8 @@ export const readGETContract = readOC
   .output(
     z
       .instanceof(Blob)
-      .refine((blob) => blob.type === 'text/markdown', {
-        message: 'Blob must have text/markdown MIME type',
+      .refine((blob) => blob.type === 'text/markdown; charset=utf-8', {
+        message: 'Blob must have text/markdown; charset=utf-8 MIME type',
       })
       .meta({
         description: 'The page markdown content',