KarpelesLab / libwallet / 28360024165

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wltswap: reserve wSOL input-wrap rent on max native-SOL swaps

A native-SOL → SPL swap creates, funds (with amount_in), and closes a
temporary wSOL wrap account; the wallet must front its rent (~2.04M lamports)
mid-tx even though it's recovered at close. resolveMaxAmountIn reserved the
OUTPUT token ATA rent but NOT this input wrap rent, so Swap:maxSpendable for
SOL over-stated by ~2.04M lamports — a max/near-max SOL swap then couldn't
fund the wrap and reverted on-chain at the swap instruction (the
field-reported "custom program error: 0xb").

Confirmed by simulating a real OKX SOL->USDC tx against mainnet: it succeeds
for a funded wallet that already holds wSOL (price impact 0.07%, so NOT
slippage and NOT a structural/our-code issue), and the only unreserved peak
cost is the input wSOL wrap rent. Renamed solanaOutputAtaReservation ->
solanaSwapSolReservation and have it reserve BOTH the input wSOL wrap (unless
the user already holds a wSOL account) and the output ATA (unless it exists).

Part of unreleased 0.4.73.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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