Add wallet chain fallback

[TuDo1403]

Summary

• Add a fallback viem chain from the selected network for AccessManager EOA writes.
• Reuse that fallback when the wallet client has no bound chain.
• Return the direct fallback transaction hash immediately after submission instead of creating an HTTP receipt waiter without an RPC URL.
• Cover the unbound wallet-client and direct fallback paths in tests.

Validation

• pnpm --filter @openzeppelin/role-manager-app exec vitest run src/core/ecosystems/evm/tests/EvmAccessManagerService.test.ts
• pnpm --filter @openzeppelin/role-manager-app exec vitest run src/core/ecosystems/evm/tests/safeSignAndBroadcast.test.ts src/core/ecosystems/evm/tests/EvmAccessManagerService.test.ts
• pnpm --filter @openzeppelin/role-manager-app exec eslint src/core/ecosystems/evm/EvmAccessManagerService.ts src/core/ecosystems/evm/tests/EvmAccessManagerService.test.ts
• pnpm --filter @openzeppelin/role-manager-app exec eslint src/core/ecosystems/evm/safeSignAndBroadcast.ts src/core/ecosystems/evm/tests/safeSignAndBroadcast.test.ts

[vercel]

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Project	Deployment	Actions	Updated (UTC)
role-manager	Building	Preview, Comment	Apr 13, 2026 9:11am
role-manager-a74d	Building	Preview, Comment	Apr 13, 2026 9:11am
role-manager-b9b9	Building	Preview, Comment	Apr 13, 2026 9:11am
role-manager-rotd	Building	Preview, Comment	Apr 13, 2026 9:11am

[gemini-code-assist]

Code Review

This pull request refactors the EvmAccessManagerService by introducing a private getFallbackChain method to centralize the creation of fallback chain configurations. This change eliminates redundant dynamic imports of defineChain and ensures that sendTransaction correctly utilizes the fallback chain when the wallet client's chain is not provided. A corresponding test case was also added to verify that transactions are initiated with the expected chain ID. I have no feedback to provide.