fix(explorer): align pending transaction details

[moscowchill]

Summary

• Align pending transactions with the shared Transaction Details card, neutral transaction-type pill and responsive From/To flow.
• Preserve Pending status, unconfirmed values, polling and mined transitions without adding mined timestamps, confirmations or paid fees.
• Preserve exact Q129 links and clipboard values, pending creation placeholders, and separate token/contract details. Calldata alone remains insufficient evidence for a Contract call label.

Validation

• 639 unit tests passed across 49 suites.
• 47 production-build browser checks passed, including 16 pending cases at phone and desktop widths, light/dark themes, exact copies, no overflow and pending-to-mined transitions.
• Existing transaction-flow and address IN/OUT regressions passed.
• Typecheck, lint (14 existing warnings), API-doc drift, production build, scoped formatting and diff checks passed.
• Screenshots were reviewed in the private release evidence.

Release scope

Frontend presentation and regression fixtures only. Backend, node, database, faucet, dependencies and hosted SDK example are unchanged. Existing polling and router navigation are retained. Deployment remains separately gated on production preflight, staged acceptance and rollback capture.