chore: deduplicate default http transport initialization

[Ocheretovich]

Remove duplicated fallback HTTP transport initialization

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PR-Codex overview

This PR focuses on refactoring the handling of the transport variable in the eip6963emitter.ts file, improving code clarity and reducing redundancy.

Detailed summary

• Introduces a new constant resolvedTransport to handle the transport variable.
• Replaces the inline transport logic with resolvedTransport in the privyProvider configuration.
• Updates the abstractProvider to use resolvedTransport instead of repeating the transport logic.

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Latest commit: 44a6f16

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[cursor]

PR Summary

Low Risk
Low risk refactor that centralizes the fallback http({ batch: true }) transport into a single resolvedTransport value; behavior should remain unchanged aside from reducing duplication.

Overview
Deduplicates the default Viem http transport fallback in announceProvider by introducing a single resolvedTransport and reusing it for both Privy transports configuration and transformEIP1193Provider.

This is a small refactor intended to keep transport selection consistent and avoid repeating the same initialization logic.

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