Add DFX authentication and Zano wallet integration#2

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TaprootFreak wants to merge 3 commits intooriginalfrom

add-dfx-zano-support

Commits on Aug 13, 2025

feat: add DFX authentication and Zano wallet integration
TaprootFreak
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fix: replace print() with printV in resource_manager.dart
TaprootFreak
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fix: update fiat currency display when fallback handler switches currency
TaprootFreak
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