fix(sdk): align DistributorClient stats address docs

[ramimbo]

Summary

• Remove unused actualUser / actualToken locals from DistributorClient stats methods.
• Update getUserStats / getTokenStats JSDoc to match the AddressParam signature.
• Drop stale overload tests for unsupported wrapper-object inputs.

Fixes #256.

Validation

• corepack pnpm --filter @fundable/sdk exec vitest --run src/__tests__/overloads.test.ts
• git diff --check

Notes

Broader SDK checks currently fail outside this patch:

• corepack pnpm --filter @fundable/sdk build fails on existing src/utils/GasEstimator.ts syntax errors.
• corepack pnpm --filter @fundable/sdk test -- --runInBand fails in unrelated GasEstimator, BalanceWatcher, deployer, transaction, stream history, and error utility tests.

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