fix(transactions): add copy button to swap order number

[wired-pasteque]

Fixes: #2701

[claude]

Claude finished @wired-pasteque's task in 1m 2s —— View job

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Code Review

• Gather context (diff vs origin/develop)
• Read surrounding code (transaction_details_table.dart, DetailsTableItem)
• Post review summary

LGTM — no correctness bugs, security issues, or regressions found. ✅

This one-line change adds copyValue to the swap order-number row in lib/features/transactions/ui/widgets/transaction_details_table.dart:215, which makes DetailsTableItem render its copy icon (lib/core/widgets/tables/details_table_item.dart:79-97).

What I verified:

• Null safety: the row is guarded by if (orderSwap.order != null), so the orderSwap.order! access is safe — identical to the displayValue on the line above.
• Consistency: this was the only order-number row in the file without a copy button; all eight other order-number rows (buy, sell, fiat payment, etc.) already use the exact same displayValue/copyValue pair, so this brings the swap case in line rather than introducing a new pattern.
• Copy behavior: DetailsTableItem only shows the icon when copyValue is non-empty, and orderNumber.toString() always produces a non-empty string, so the button reliably appears and copies exactly what's displayed.

One optional nit (not blocking, and the existing code has the same duplication everywhere): the orderSwap.order!.orderNumber.toString() expression is evaluated twice; a local variable would avoid that, but matching the surrounding idiom is arguably better here.

Note: I can't submit formal inline PR review comments, so findings are posted in this comment — there were none to report inline anyway.