KarpelesLab / libwallet / 24923075580

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wltswap/jupiter: GET /ultra/v1/order (was 404'ing on POST)

Jupiter's Ultra /order endpoint accepts only GET — POST returns
HTTP 404. Our adapter has been POSTing JSON since the swap feature
landed, so every Quote() call on Solana failed with:

  POST https://api.jup.ag/ultra/v1/order → HTTP 404: 404 Not Found

Switch to GET with url.Values; /execute remains POST (the signed-
transaction blob doesn't fit a query string). Live SOL→USDC quote
now returns 200 with a valid outAmount.

While here: surface the upstream errorMessage when the order
returns HTTP 200 but transaction:"" (insufficient funds, no
route, slippage too tight). Was returning generic "Jupiter
returned an empty order"; now passes through "Insufficient funds"
etc. so the frontend can display something useful.

Test pinned to GET so a future refactor that flips back to POST
fires loudly instead of silently 404'ing in production.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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