Refactor send-transaction and sign typed data to v5

[joaquim-verges]

Changes

• Linear: https://linear.app/thirdweb/issue/INF-171/
• Here is the problem being solved.
• Here are the changes made.

How this PR will be tested

• Open the dashboard and click X. Result: A modal should appear.
• Call the /foo/bar API. Result: Returns 200 with "baz" in the response body.

Output

(Example: Screenshot/GIF for UI changes, cURL output for API changes)

---

PR-Codex overview

This PR focuses on enhancing transaction handling and data signing in the backend, particularly with smart wallets and transaction overrides. It introduces new types, improves error handling, and refines transaction preparation and queuing.

Detailed summary

• Updated src/shared/utils/transaction/types.ts to import and define types.
• Enhanced src/server/routes/contract/write/write.ts to better handle transaction overrides.
• Modified src/server/routes/backend-wallet/sign-typed-data.ts to include chainId and primaryType in the request body, improving smart wallet handling.
• Updated signing logic to use account.signTypedData.
• Refined transaction preparation in src/server/routes/backend-wallet/send-transaction.ts, integrating overrides and simplifying transaction queuing.

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[joaquim-verges]

• Refactor send-transaction and sign typed data to v5 #866 👈 (View in Graphite)
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