fix(wallet): roll SDK for SIA withdrawal hardening

[CharlVS]

Summary

• Roll the sdk submodule from b8555f1 to 6dddeee picking up:
  • feat(sia)!: harden activation and withdrawal handling (feat(cex_rates): implementation backend of #326 #343)
  • fix(ui): correct TRC20 badge icon mapping (Toggle currency on banner click #344)
• Omit HD source derivation path selection for SIA withdrawal preview/submit requests in the main app
• Add withdraw-form coverage for SIA preview params and Trezor blocking behavior

Why

The SDK roll hardens SIA activation and withdrawal handling and corrects the TRC20 badge icon mapping. The app-side guard keeps SIA requests from sending an unsupported HD derivation path while preserving source-address selection for other multi-address protocols.

Impact

• SIA flows use the updated SDK behavior
• SIA preview requests no longer include from derivation data
• Trezor + SIA remains blocked before any withdrawal call is made
• TRC20 tokens display the correct parent-chain badge icon

Validation

• dart format lib/bloc/withdraw_form/withdraw_form_state.dart test_units/tests/wallet/coin_details/withdraw_form_bloc_test.dart
• flutter analyze lib/bloc/withdraw_form/withdraw_form_state.dart test_units/tests/wallet/coin_details/withdraw_form_bloc_test.dart
• flutter analyze still reports the repository's existing analyzer backlog outside this diff

[github-actions]

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https://walletrc--pull-3471-merge-29opvi70.web.app

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