Next.js Delta swap

You are working in a Next.js 14 App Router project with Wagmi v2 and Viem already configured.

Build a `/swap-gasless` page that lets the user place a Velora Delta intent for any ERC-20 → any ERC-20.

Requirements:
- Use the Velora Delta REST API at `https://api.velora.xyz`. Endpoints: `POST /quote` (with `mode=DELTA`), `POST /delta/orders/build`, `POST /delta/orders`, `GET /delta/orders/:id`.
- Always pass `partner=my-app-name` on every quote call (replace `my-app-name` with the host app's partner-key string).
- For the native ETH placeholder, use `0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE`.
- Always include `slippage` (basis points) in the quote — omitting it returns 400.
- Pass the `delta` block returned by the quote verbatim to `/delta/orders/build` as `price`. Do not normalize, sort, or re-stringify it. Include the `hmac` from the same quote response.
- Use Viem's `signTypedData` to sign the EIP-712 payload returned by `/delta/orders/build`. Then submit to `/delta/orders`.
- Poll `GET /delta/orders/:id` and display lifecycle states (`pending` → `filled` / `failed`).
- Token approvals must be granted to the **Delta contract** (not Augustus). The address is per-chain — fetch from /resources/chains-and-contracts or read it from the typed-data `domain.verifyingContract`.

Reference these docs and follow them exactly:
- https://docs.velora.xyz/delta/overview
- https://docs.velora.xyz/delta/how-it-works
- https://docs.velora.xyz/api-reference/delta/quote
- https://docs.velora.xyz/api-reference/delta/orders-build
- https://docs.velora.xyz/api-reference/delta/orders
- https://docs.velora.xyz/delta/eip-712-typed-data-reference
- https://docs.velora.xyz/delta/order-lifecycle-and-status-codes

Do NOT mutate the `delta` block between quote and build. Do NOT grant approval to Augustus — Delta has its own spender contract.