refactor: migrate app/util/test/ganache.js to TypeScript

[devin-ai-integration]

refactor: migrate app/util/test/ganache.js to TypeScript

Summary

Migrates app/util/test/ganache.js to TypeScript (ganache.ts). Key changes:

• Adds a GanacheStartOptions interface (extending Partial<ServerOptions>) with mnemonic as a required field
• Explicitly types _server as private _server: Server | undefined
• Adds return type annotations to all methods
• Adds null-guard checks for getProvider() in getAccounts() and getBalance() (previously these would throw unclear "cannot read property of undefined" errors)
• Uses type assertions (as string[], as string) on provider.request() return values

No import path changes were needed — all consumers use extensionless paths (e.g. ../../app/util/test/ganache) that resolve to .ts automatically.

Review & Testing Checklist for Human

• Verify that Server, ServerOptions, and EthereumProvider are valid exports from the ganache package (they appear in ganache/dist/ganache.d.ts but confirm they resolve at build time)
• Confirm the GanacheStartOptions interface doesn't conflict with properties already in ServerOptions — several fields (port, blockTime, etc.) are redeclared
• Verify that the new null-check throws in getAccounts()/getBalance() don't break any existing e2e test flows that might rely on the previous error behavior
• Check that all consuming files (e2e/fixtures/utils.js, e2e/fixtures/fixture-helper.js, wdio/utils/ganache.js) still resolve the import correctly after the rename

Notes

• Link to Devin run
• Requested by: @shayanshafii

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✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 4 additional findings.