feat(mobile): balance card with Lens fiat value - #595
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Show the primary XLM balance on the dashboard the moment the app opens, with its USD value from the Lens price oracle. The balance is loaded from Horizon (unfunded accounts read as zero) and is always shown once ready; the fiat line degrades to an em dash whenever the oracle is slow, gated, or offline, so pricing never blocks the card. Adds lib/fetchPrice.ts (native port of the web wallet's oracle client) and components/BalanceCard.tsx, and mounts the card on the home route. Closes Miracle656#458
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Summary
Adds the dashboard's primary balance card (backlog item 30) — native XLM plus its fiat value from the Lens price oracle — the most-looked-at element in the product, so it loads fast and degrades gracefully.
Changes
lib/fetchPrice.ts— native port of the web wallet's oracle client (frontend/wallet/lib/fetchPrice.ts), readingEXPO_PUBLIC_LENS_URL. Best-effort: every failure (402 x402 gating, 404, timeout, malformed body) collapses tonull. Adds pureusdValue/formatUsdhelpers.components/BalanceCard.tsx— self-loading card. Balance comes from Horizon (unfunded accounts read as0, not an error) and is authoritative; the fiat line shows an em dash whenever the price feed is unavailable, so a slow/gated oracle never blocks the card. Loading, no-wallet, and error states included.app/index.tsx).Acceptance
—, balance still renders)Testing
tsc --noEmitcleanjest lib/__tests__/fetchPrice.test.ts— 10/10 passing (USDC pin, success, non-OK/402, missing-price, network-error → null; usdValue + formatUsd)Closes #458