feat: buy currencies with other currencies#499
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Adds a payment-currency step to the buy flow: USDF or any launchpad token can fund a buy via the launchpad-to-launchpad StatefulSwap. Fixes multi-lookup-table account ordering in the transaction compiler and the funds gate's cross-rate compare.
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Buying a currency now goes through a payment-currency step: enter an amount (capped at your highest spendable balance), pick what to pay with — USDF or any other currency you hold — and confirm. Paying with a currency routes through the launchpad-to-launchpad swap, showing the pool's 1% exchange fee up front; paying with USDF keeps the simple summary. If the amount plus fee doesn't fit the selected balance, Buy offers to switch to the maximum amount instead. The currency being bought is excluded from the payment list, and with nothing spendable the amount screen becomes an Add Money shortcut.
Along the way this fixes two latent bugs the new path exposed: the transaction compiler ordered lookup-table accounts globally instead of grouped by table (invisible until the first two-table transaction), and the funds gate compared amounts across two different exchange rates, which could crash on a pinned quote after a rate tick.
Since entry is now capped at spendable balances, the old enter-more-to-fund shortcut is gone; the funding regression tests enter Add Money from the wallet instead.