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Wire the Buy direction of the swap card to the module's server-side
swapExactOutQuote, mirroring the exact-input path. AmmUiBackend gains a
swapExactOutQuote(tokenIn, tokenOut, amountOutDecimal, slippageBps) slot
returning { requiredInRaw, maxInRaw, priceImpactBps } (read-only).
Editing the Buy amount now debounces a swapExactOutQuote call and sources the
required input (shown in the Sell field), the price impact, and the slippage
ceiling from it — the exact figures come straight from the quote's raw integer
strings, so the preview matches execution and no reserve orientation happens
client-side. A retyped amount invalidates the quote up front.
SwapSummary's last row is generalised from a hardcoded "Min received" to a
direction-aware bound (boundLabel/boundText): "Min received" (min out) for
exact input, "Maximum sent" (max in) for exact output. SwapConfirmationSummary
is updated for the renamed property.
The Buy field remains preview-only — canSubmit is still sell-only, pending the
exact-output submit wiring. The now-orphaned DummySwapState pricing helpers are
left for a follow-up cleanup.