[IDL] Add Confidential Mint/Burn instructions and types

[gitteri]

Add Confidential Mint/Burn instructions and types

Summary

This updates interface/idl.json to expose the Confidential Mint/Burn extension in the public IDL so downstream code generators (JS, Rust, etc.) can produce clients with first-class support. Also fixes a minor docs typo.

What changed

• Added six new instructions for Confidential Mint/Burn:
  • initializeConfidentialMintBurn: initialize extension during mint init
  • rotateSupplyElGamalPubkey: rotate supply ElGamal public key (pending burn must be zero)
  • updateDecryptableSupply: update decryptable supply for the mint
  • mintToConfidentialBalance: mint into confidential balance (with proof offsets)
  • burnFromConfidentialBalance: burn from confidential balance (with proof offsets)
  • applyPendingBurn: apply pending burn amount to confidential supply
• Introduced two new defined types:
  • encryptedSupply (64 bytes ElGamal ciphertext)
  • decryptableSupply (36 bytes authenticated encryption)
• Extension schema changes:
  • Replaced prior empty variant with a struct variant confidentialMintBurnConfig carrying:
    • supplyElgamalPubkey: PublicKey
    • decryptableSupply: encryptedSupply
  • Added a new marker variant confidentialMintBurn documenting inclusion of mint-burn configuration.
• Fixed typo in docs:
  • “despots and transfers that an account can receiver” → “deposits and transfers that an account can receive”.
• Reran command to generate new ts clients
  • Only generated the ts client for now

Motivation

• Unblocks up-to-date, multi-language client generation for the Confidential Mint/Burn feature.
• Aligns the IDL with the on-chain program’s capabilities and proof-wiring requirements.

Impact on generated clients

• New client-side methods for the six instructions, with required accounts and proof instruction offsets.
• New type definitions surfaced in SDKs for confidential supply representation.
• Extension variant change from empty to struct will surface as a typed config object in generated clients.

Backward compatibility

• Additive for instructions and types.
• The extension enum shape changes from an empty variant to a struct variant for confidential mint-burn config; any consumer relying on the empty variant must adapt to the new structured variant name (confidentialMintBurnConfig) and fields. Generated clients will reflect this automatically after regeneration.

Follow-ups

• Regenerate rust client to pick up the new IDL.
• Add e2e tests in client repos covering mint/burn flows with proof offsets and multisig remaining accounts.