feat(sdk): add token safety and fee support helpers

[CharlVS]

Summary

• prevent custom-token storage collisions unless the stored and requested contracts are the same on the same network
• export shared custom-token exception types and add storage tests for TRC20 conflict handling
• add explicit fee-estimation support classification for withdrawal protocols and cover unsupported TRX/TRC20 behavior in tests
• update the bundled coins commit in the framework build config

Verification

• dart format sdk/packages/komodo_coin_updates/lib/src/coins_config/custom_token_storage.dart sdk/packages/komodo_coin_updates/lib/src/coins_config/custom_token_store.dart sdk/packages/komodo_coin_updates/test/custom_token_storage_test.dart sdk/packages/komodo_defi_sdk/lib/src/withdrawals/withdrawal_manager.dart sdk/packages/komodo_defi_sdk/test/withdrawals/withdrawal_manager_fee_support_test.dart sdk/packages/komodo_defi_types/lib/komodo_defi_types.dart sdk/packages/komodo_defi_types/lib/src/types.dart sdk/packages/komodo_defi_types/lib/src/assets/custom_token_exceptions.dart
• flutter analyze sdk/packages/komodo_coin_updates/lib/src/coins_config/custom_token_storage.dart sdk/packages/komodo_coin_updates/lib/src/coins_config/custom_token_store.dart sdk/packages/komodo_coin_updates/test/custom_token_storage_test.dart sdk/packages/komodo_defi_sdk/lib/src/withdrawals/withdrawal_manager.dart sdk/packages/komodo_defi_sdk/test/withdrawals/withdrawal_manager_fee_support_test.dart sdk/packages/komodo_defi_types/lib/komodo_defi_types.dart sdk/packages/komodo_defi_types/lib/src/types.dart sdk/packages/komodo_defi_types/lib/src/assets/custom_token_exceptions.dart

Notes

• the targeted analyze pass reported only info-level lint findings in pre-existing legacy areas of withdrawal_manager.dart; there were no blocking errors

[chatgpt-codex-connector]

You have reached your Codex usage limits for code reviews. You can see your limits in the Codex usage dashboard.
To continue using code reviews, you can upgrade your account or add credits to your account and enable them for code reviews in your settings.

[github-actions]

Visit the preview URL for this PR (updated for commit 46dc456):

https://komodo-playground--pr319-feat-sdk-pending-upd-0nb3gd8y.web.app

_{(expires Wed, 25 Mar 2026 17:20:56 GMT)}

_{🔥 via Firebase Hosting GitHub Action 🌎}

_{Sign: 2bfedd77fdea45b25ba7c784416e81f177aa5c47}