Move money: Max on both directions, inline in the amount field

Into Spending gains a Max (fee-aware — it asks the tx builder what a
sweep would actually deliver, so the mining fee can't make the board
fail), and both directions now carry Max as a small affordance inside
the input's right edge instead of a button eating a third of the row.
It only appears when there's a balance to max. Balance face height
trimmed to match its shorter content.

Co-Authored-By: Claude Fable 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Wvj4aoeMZwA7VUGdJP9Swi

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