fix: avoid deprecated waiter in airdrop

[atharva-patill]

Summary

Refactors Kit's airdrop confirmation flow to stop using the deprecated waitForRecentTransactionConfirmationUntilTimeout waiter.

• Adds waitForSignatureConfirmationWithTimeout for signature-only confirmation with the existing timeout strategy.
• Updates Kit's airdrop implementation to use the new waiter.
• Keeps waitForRecentTransactionConfirmationUntilTimeout available and deprecated for backwards compatibility.
• Preserves the existing timeout, abort, and transaction-error behavior.

Testing

• Added coverage for successful confirmation, timeout, abort, commitment forwarding, and strategy cancellation.
• Existing deprecated waiter tests remain passing.
• All focused transaction-confirmation tests pass.
• Typecheck, ESLint, Prettier, and git diff --check pass.

Fixes #1784

[changeset-bot]

🦋 Changeset detected

Latest commit: 04f1790

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 48 packages

Name	Type
@solana/transaction-confirmation	Major
@solana/kit	Major
@solana/react	Major
@solana/accounts	Major
@solana/addresses	Major
@solana/assertions	Major
@solana/codecs-core	Major
@solana/codecs-data-structures	Major
@solana/codecs-numbers	Major
@solana/codecs-strings	Major
@solana/codecs	Major
@solana/compat	Major
@solana/errors	Major
@solana/fast-stable-stringify	Major
@solana/fixed-points	Major
@solana/functional	Major
@solana/instruction-plans	Major
@solana/instructions	Major
@solana/keys	Major
@solana/nominal-types	Major
@solana/offchain-messages	Major
@solana/options	Major
@solana/plugin-core	Major
@solana/plugin-interfaces	Major
@solana/program-client-core	Major
@solana/programs	Major
@solana/promises	Major
@solana/rpc-api	Major
@solana/rpc-graphql	Major
@solana/rpc-parsed-types	Major
@solana/rpc-spec-types	Major
@solana/rpc-spec	Major
@solana/rpc-subscriptions-api	Major
@solana/rpc-subscriptions-channel-websocket	Major
@solana/rpc-subscriptions-spec	Major
@solana/rpc-subscriptions	Major
@solana/rpc-transformers	Major
@solana/rpc-transport-http	Major
@solana/rpc-types	Major
@solana/rpc	Major
@solana/signers	Major
@solana/subscribable	Major
@solana/sysvars	Major
@solana/transaction-introspection	Major
@solana/transaction-messages	Major
@solana/transactions	Major
@solana/wallet-account-signer	Major
@solana/webcrypto-ed25519-polyfill	Major

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