Feat/b6 post loop projected rates#176
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- Add rate history storage (B3): recordRateSnapshot / getRateAtWindow persist timestamped APY snapshots in localStorage, keyed by pool/asset/field - Add renderTrendArrow: computes (current-past)/|past| delta, renders ▲/▼ with percentage and a tooltip showing absolute before/after values + window - Hook into renderSelectedAsset to record and display arrows on net supply APY and net borrow cost rows - Add .rate-trend CSS (inline, 10px mono, green up / red down)
- Add hist-chart-wrap section in stats-body with 7d/30d/1y window selector - renderHistoryChart reads B3 localStorage snapshots, renders SVG polyline time-series with x/y axis labels and invisible hit-area rects for tooltip - Pointer tooltip shows exact date + APY value at cursor position - Window selection persists in _histWin session variable (default 30d) - Hooked into renderSelectedAsset; window buttons re-render on click - Add CSS for chart, window buttons, cursor dot, and empty state
- updatePreview now computes two APY values:
- Current pool APY: projectRates(rs, 0, 0) × leverage — pre-loop snapshot
- Projected APY after deposit: projectRates(rs, supply-oldSupply, borrow-oldBorrow)
× leverage — accounts for how the user's supply/borrow shifts utilization
- HTML: added 'Current pool APY' row above 'Projected APY after deposit' row
- Tooltip updated to explain the distinction and show both values
- projectRates math matches Rust simulate binary (same 3-kink IR model)
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Closes #33. The leverage preview now shows both the current pool APY (pre-loop snapshot) and the projected APY after the user's deposit, making it clear how the position shifts
pool utilization and rates.
Changes:
to explain the distinction
Math verification against src/bin/simulate.rs:
Both use the same 3-kink IR model: utilization → base rate → borrow_apr = base_rate × ir_mod → supply_apr = borrow_apr × util × (1 − bstop_rate). The TS version uses integer
arithmetic matching the on-chain Soroban contract; the Rust version uses floats — both are equivalent.
Acceptance: