fix(trade): clear margin requirement copy in the order receipt

[dcccrypto]

Item 2 of the terminal UX fixes. The receipt row labeled Margin req. actually showed capital → capital − margin — a balance readout — so the real requirement never appeared and the label misdescribed the number. Now:

• Margin — the collateral this order actually reserves (matches the confirm modal's "Margin Required")
• Available to trade — before → after, computed on the same available basis (capital − locked margin) as the account strip, so the strip and receipt can never disagree

tsc clean; no logic beyond the two display rows changed.

🤖 Generated with Claude Code

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