Funding-flow follow-ups from #504 review (non-blocking)

Non-blocking findings from @WiktorStarczewski's re-review of #504 (https://github.com/0xMiden/wallet/pull/504), split out so they don't hold the lifecycle work:

- **Swap default pair is race-dependent** — `getSwapTokens()` reorders on native-asset discovery while `SwapManager` seeds `useState(() => getSwapTokens()[0]!)` once at mount → cold start defaults to IMIDEN→IETH, warm start to MIDEN→IMIDEN. Pick defaults by symbol, or reorder only for display.
- **Reduced-motion guard for the two new infinite animations** in `main.css` (hourglass flip + progress runner), and/or move them out of `main.css` per the frontend skill; also answers @0xnullifier's 08-07 nit about animations in `main.css`.
- **`faucetHeroActive` can outlive the faucet card** — gate it on `showFaucetPrompt` so pending-notes isn't suppressed against an unmounted card.
- **Clamp the resume backstop** — `Math.min(FAUCET_FUNDS_ARRIVAL_TIMEOUT_MS, …)` and reject a future `requestedAt` when reading the marker (backward clock step currently wedges the hero).
- **>3-minute mint can be minted twice** — the backstop returns a fully actionable card without completing the prompt; decide whether an "already requested" marker should outlive the backstop.
- **"Funded!" amount re-mixes baseline notes** — the success sub-label totals all pending notes, not just the newly arrived mint.
- **Success-beat tests run on real timers** (3000/3500ms budgets against a 2400ms beat).
- **NIT: abort-forwarding test asserts nothing** — `faucet-api.test.ts` 429-region test structurally equates two non-aborted AbortSignals; assert abort→rejection instead.
- **NIT: 429 back-off sleep ignores the caller's abort** (delays cancellation ≤30s).
- **NIT: marker clear writes `null` instead of removing the key.**
- **NIT: `role="button"` card + real inner buttons** — ARIA exposure of the dismiss X, and focus loss when the hero disables `onClick`; consider `aria-disabled` + retained `tabIndex`.