feat(tempo): add encryptedDeposit.prepare

[struong]

Summary

Adds zone.encryptedDeposit.prepare for preparing encrypted zone deposit payloads without broadcasting a transaction. Prepared payloads can be passed directly to zone.encryptedDeposit or zone.encryptedDepositSync for broadcast.

Motivation

Prepared encrypted deposits let one party choose the private zone recipient and memo while another wallet or service submits the public parent-chain deposit transaction.

Changes

• Added a prepared encrypted deposit return type and nested encryptedDeposit.prepare helper.
• Allowed encryptedDeposit, encryptedDepositSync, and encryptedDeposit.calls to consume prepared payloads.
• Bound nested .prepare helpers on decorated clients, enabling client.zone.encryptedDeposit.prepare(...).
• Added docs under zone.encryptedDeposit#prepared-usage, updated the zones deposit guide, and added a changeset.
• Added focused runtime, e2e, and type coverage for prepared encrypted deposits.

Testing

• git diff --check
• corepack pnpm exec biome check ...
• corepack pnpm exec vitest --typecheck.only src/tempo/actions/zone.test-d.ts
• VITE_TEMPO_ENV=testnet corepack pnpm test src/tempo/e2e.test.ts -t "zone.encryptedDeposit.prepare"
• corepack pnpm docs:build

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🦋 Changeset detected

Latest commit: 7a22c92

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

This PR includes changesets to release 1 package

Name	Type
viem	Minor

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commit: 63d7354