Feat/dry run preview modal#170
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- Add rate_snapshots table + index to schema.sql - Cron writes (pool, asset, supply_rate, borrow_rate, util, blnd_eps) snapshot each 15-min tick - Cron prunes snapshots older than 365 days - Add GET /rates?pool=&asset=&window= public endpoint - Expose util + blndEps fields on ReserveRates
- Add fetchEwmaRates() to blend.ts: fetches 30d snapshots from B3 /rates endpoint and computes EWMA with 7-day half-life (α ≈ 0.0029 per 15-min tick) - Add apyMode state (instant | smoothed) and activeRates() helper in main.ts - Net supply APY and net borrow cost rows use activeRates() — affected by toggle - Position net APY in renderPosition() also uses activeRates() - Toggle button (#apy-mode-toggle) in APR section header switches modes - EWMA results cached per pool+asset; cache cleared on pool/asset switch - Docs panel (<details id=ewma-docs>) explains EWMA, half-life, and formula
- blend.ts: export buildOpenRequestsVec, buildCloseRequestsVec, buildIncreaseRequestsVec, buildDecreaseRequestsVec to build submit requests without assembling signed XDR - main.ts: showDryRunModal() calls dryRunSubmit via soroban-rpc simulateTransaction, shows net tokens moved, current→projected HF, estimated fee, and any simulation errors; resolves Promise<boolean> so actions bail early on cancel - Wired into openPosition, adjustLeverage, addFundsToPosition — modal renders before the wallet signing prompt - index.html: dry-run modal markup reusing alert-modal shell - style.css: dryrun-table, dryrun-error, dryrun-actions styles Closes Dgetsylver#17
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What changed
blend.ts — four new exported helpers that build the xdr.ScVal requests vec for each action type without
assembling a signed XDR:
dryRunSubmit was already present and is unchanged.
main.ts — showDryRunModal() calls dryRunSubmit, renders the modal with:
Returns Promise. Wired into openPosition, adjustLeverage, and addFundsToPosition — cancel aborts the
flow before the wallet is ever prompted.
index.html — modal markup reusing the existing .alert-modal-overlay shell.
style.css — .dryrun-table, .dryrun-error, .dryrun-actions styles.
Acceptance checklist
Closes #17