refactor(frontend): extract DetailRow for transaction details dialog

[reneaaron]

Summary

Cleans up the transaction details dialog by extracting a single DetailRow component to replace ~16 hand-written rows with the same shape. Moves inter-row spacing to the parent (gap-6), dropping the duplicated mt-6 / mt-8 margins (the mt-8 rows looked accidental).

DetailRow takes a copyable prop for rows that should show a copy icon (BOLT-12 Offer Id, Preimage, Hash, Invoice, Failure Reason, Metadata).

No behavioral change.

Test plan

• Open a transaction's details and visually compare against master — spacing and copy icons should match
• Verify each row renders for transactions of different shapes (incoming, outgoing, failed, with metadata, with bolt12 offer)
• Confirm copy icons still work

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 4a0ad209-e7bc-481c-befc-ca365389dd8a

📥 Commits

Reviewing files that changed from the base of the PR and between 30ef3c2 and 5427e4e.

📒 Files selected for processing (4)

• frontend/src/components/OnchainTransactionItem.tsx
• frontend/src/components/TransactionDetailRow.tsx
• frontend/src/components/TransactionItem.tsx
• frontend/src/components/TransactionLabels.tsx

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch refactor/transaction-detail-rows

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[reneaaron]

@coderabbitai full review

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Full review triggered.

[im-adithya]

tACK, nice 🙌