fix(sdk): expose custom token cleanup

[CharlVS]

Summary

• add a public SDK helper to delete persisted custom tokens
• invalidate activated-assets cache after custom token cleanup
• support wallet preview rollback without importing SDK internals

Related

• wallet PR: feat(wallet): roll SDK and complete TRON integration gleec-wallet#3446

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[github-actions]

Visit the preview URL for this PR (updated for commit 47b69e0):

https://komodo-playground--pr321-codex-custom-token-p-ri3wyfsk.web.app

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