Note

Replace SHA-256 with async xxhash64 for file/buffer hashing, add backward-compatible hash matching, update upload/sync logic, and add xxhash-wasm dependency.

• Utils / Hashing:
  • Replace SHA-256 with async xxh64 hashing (computeBufferHash) using xxhash-wasm and prefix xxh64:.
  • Add hashesMatch to support old SHA-256 hashes (no prefix) and new xxh64 hashes.
  • Make computeFileHash async and switch to xxh64.
  • Update uploadFile to store xxh64 hash in file metadata.
  • Update initialSync to compare hashes via hashesMatch instead of direct equality.
• Dependencies:
  • Add xxhash-wasm.

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