feat(swap): Implement maker fallback in TakerBloc

[takenagain]

TODO:

• prototype removing taker/maker order selection: only have "taker" swap form
  • remove maker form and tab switcher
  • update buy dropdown to show all coins, but keep best_orders at the top
• re-review available rpcs for swaps
• add swap RPCs to SDK (in-progress)
• test functionality

Summary

• extend DexRepository with setPrice helper
• update TakerBloc to fetch latest orders before submitting
• if no matching order exists, place a maker order via setPrice
• remove Maker form BLoC and all maker widgets
• drop maker-specific UI and section switching
• update router and helpers accordingly
• simplify DEX list wrapper to always show the taker form
• parse setPrice response and return order UUID
• use Logger in TakerBloc and implement helper wait function
• handle maker fallback with try/catch and structured logging

Testing

• dart format lib/bloc/dex_repository.dart lib/bloc/taker_form/taker_bloc.dart
• flutter analyze lib/bloc/dex_repository.dart lib/bloc/taker_form/taker_bloc.dart

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[github-actions]

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