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

[devin-ai-integration]

Summary

Migrates app/util/test/ganache.js from JavaScript to TypeScript as part of the ongoing JS→TS migration effort.

Changes:

• Renamed ganache.js → ganache.ts
• Added a private _server field with proper type (ReturnType<typeof ganache.server> | undefined)
• Defined GanacheStartOptions type as ServerOptions & { mnemonic: string } to enforce the required mnemonic
• Typed getProvider() return as EthereumProvider | undefined
• Typed getAccounts() return as Promise<string[]> with a null guard on the provider
• Typed getBalance() return as Promise<number | string> with a null guard on the provider
• Typed quit() return as Promise<void>
• Imported EthereumProvider and ServerOptions types from ganache
• No behavioral changes — only type annotations added

Importers (e2e/fixtures/fixture-helper.js, e2e/fixtures/utils.js, wdio/utils/ganache.js) are unaffected since TypeScript's module resolution resolves .ts files from extensionless imports.

Review & Testing Checklist for Human

• Verify the GanacheStartOptions type (ServerOptions & { mnemonic: string }) is compatible with all call sites (e.g., fixture-helper.js passing defaultGanacheOptions)
• Confirm no snapshot or test regressions by running yarn test --findRelatedTests app/util/test/ganache.ts

Notes

• The ganache package is declared as a dependency (^7.9.2) but may not be installed locally due to a known yarn install issue with a deleted transitive dependency. Types were verified against the published ganache@7.9.2 type definitions.
• Existing importers are all .js files and use extensionless imports, so no import path updates are needed.

Link to Devin session: https://app.devin.ai/sessions/41ca62da4ea54ade943272546ffc8a03
Requested by: @shayanshafii

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✅ Devin Review: No Issues Found

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

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