feat(frontend): add transaction simulation and preview#463
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) - Add SimulationError class to api.ts — distinct from real tx failures - Add simulateWriteCall() helper: builds and simulates a state-changing transaction against the RPC node, returns SimulationPreview with estimated fee in stroops; throws SimulationError on contract rejection vs plain Error on network/RPC failure - Add simulateCastVote() and simulateCreateProposal() convenience wrappers - Add VoteSimulationPreview component: radio group for Yes/No/Abstain, Simulate button, success panel (estimated fee), contract-rejection panel (yellow, distinct styling), network-error panel (red) - Integrate VoteSimulationPreview into ProposalDetail — shown when wallet is connected, proposal is Active, and user has not yet voted Closes PrincessnJoy#288
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Summary
Closes #288
Users and developers can now preview a vote transaction — including the estimated fee — before submitting it on-chain. Simulation errors (e.g. already voted, proposal inactive) are shown with distinct styling so users understand whether a failure is a contract-level rejection or a network problem.
Changes
frontend/src/api.tsSimulationErrorclass — extendsErrorwith the raw RPC response; thrown specifically for contract-level simulation rejections, distinct from network/connection failuressimulateWriteCall(sender, contractId, method, args)— generic helper that builds a transaction, runs it throughserver.simulateTransaction(), and returns aSimulationPreview(fee in stroops, decoded return value) or throwsSimulationErrorsimulateCastVote(voter, proposalId, vote)— convenience wrapper for cast_votesimulateCreateProposal(...)— convenience wrapper for create_proposalfrontend/src/components/VoteSimulationPreview.tsx(new)simulateCastVotewith the connected walletrole="status"/role="alert"witharia-livefrontend/src/components/ProposalDetail.tsxVoteSimulationPreviewwhen wallet is connected, proposal is Active, and user has not yet votedError handling
SimulationErrorError