fix(storage): replace jsdelivr with esm.sh for aws-sdk

Switched the CDN provider for the AWS SDK (R2 client) from `jsdelivr` to `esm.sh` to resolve a runtime dependency error ("does not provide an export named 'blobHasher'"). This error was caused by a broken bundling of the transitive dependency `@smithy/hash-blob-browser` on `jsdelivr`.

This change updates the `AWS_SDK_SPECIFIER` constant in `js/storage/r2-s3.js`.

js/storage/r2-s3.js

@@ -1,7 +1,6 @@
 // js/storage/r2-s3.js
 
-const AWS_SDK_SPECIFIER =
-  "https://cdn.jsdelivr.net/npm/@aws-sdk/[email protected]/+esm";
+const AWS_SDK_SPECIFIER = "https://esm.sh/@aws-sdk/[email protected]";
 
 const disableNetworkImports = Boolean(
   globalThis?.__BITVID_DISABLE_NETWORK_IMPORTS__