Apy stress test

[innovativedesign-lab]

Close: #34

Summary

Here's a summary of every change made:

blend.ts
— new pure function + interface

StressScenario interface — holds util, borrowApr, supplyApr, netApy, hf, daysToLiq, and inRThreeKink for one scenario
computeStressScenario(rs, targetUtil, leverage) — runs the full 3-kink Blend rate model at an arbitrary target utilization (not the current pool state), computes net APY at the given leverage, HF, and days-to-liquidation from the interest spread. Flags inRThreeKink when util > 95% so the UI can surface the steep r_three risk clearly. Pure function, no RPC calls.
index.html
— new

Details

panel inside #stats-body

Collapsible ⚡ APY Stress-Test panel with a summary hint line (shows active scenario at a glance without opening)
Four preset buttons: 80% / 90% / 95% / 99% — 95% and 99% styled in danger red since they cross the r_three kink
Custom button (default active) with a range slider (1–99%)
Results table: Utilization · Borrow APR · Net APY · Days to Liq — active row highlighted, kink rows in red
r_three kink warning banner, shown only when any displayed scenario exceeds 95%
main.ts
— render logic + wiring

_stressActiveUtil / _stressCustomUtil state variables
renderStressPanel(rs) — computes all visible scenarios via computeStressScenario, renders the results table with color-coded APY and liquidation days, updates the summary hint
initStressPanel() — wires preset buttons, Custom button, and slider events; called once at startup
renderStressPanel called from renderSelectedAsset() (on data load) and updatePreview() (on leverage slider move) so the panel stays live as the user adjusts leverage
style.css
— ~60 lines of new styles matching the existing design system (surface/border/primary/danger tokens, mono font for numbers, kink row danger styling)

Related Issue

Closes #34

Checks

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[innovativedesign-lab]

Done, Close: #189