refactor: store thumbhash as stirng

lib/cache/image.ts

@@ -54,7 +54,9 @@ export function createThumbhash(
           );
           if (!bytes) return;
           const hash = generateThumbhash(bytes, _image.width, _image.height);
+
           if (hash) {
+            const b64 = btoa(String.fromCharCode(...hash));
             cache.set(
               getCacheKey({
                 url,
@@ -62,9 +64,9 @@ export function createThumbhash(
                 width: _image.width,
                 height: _image.height,
               }),
-              hash,
+              b64,
             );
-            res(hash);
+            res(b64);
           }
         });
       });
@@ -96,7 +98,6 @@ export function getThumbhash({ url }: { url: string }) {
       width: 200,
       height: 200,
     }),
-    true,
   );
 }