Support emitted event date on the logs list

[tom2drum]

Description and Related Issue(s)

• Resolves Support emitted event date on the logs list #3131
• Resolves Change copy button alignment in Logs, etc #3244

Adds support for displaying the emitted event date on the logs list on contract (address) and transaction views. When viewing logs in address context and the API provides block_timestamp for a log entry, a "Timestamp" row is shown with the event time using the existing DetailedInfoTimestamp component.

Proposed Changes

• types/api/log.ts — Added block_timestamp: string | null to the Log interface so the frontend can consume the field when the backend exposes it (see blockscout/blockscout#13572).
• ui/shared/logs/LogItem.tsx — When type === 'address' and both transaction_hash and block_timestamp are present, render a "Timestamp" row with DetailedInfoTimestamp. No change for transaction view (single tx, so timestamp is redundant).
• stubs/log.ts — Added block_timestamp to the log stub for local/dev.
• LogItem.pw.tsx — Added a test case for the default data type scenario that includes block_timestamp so the timestamp row is covered.
• LogDecodedInputDataTable.tsx — Minor copy button alignment fix.

Breaking or Incompatible Changes

None.

Additional Information

Backend support is tracked in blockscout/blockscout#13572. The UI is backward-compatible: when block_timestamp is missing or null, the timestamp row is not shown.

Checklist for PR author

• I have tested these changes locally.
• I added tests to cover any new functionality, following this guide
• Whenever I fix a bug, I include a regression test to ensure that the bug does not reappear silently.
• If I have added a feature or functionality that is not privacy-compliant (e.g., tracking, analytics, third-party services), I have disabled it for private mode.
• If I have added, changed, renamed, or removed an environment variable
  • I updated the list of environment variables in the documentation
  • I made the necessary changes to the validator script according to the guide
  • I added "ENVs" label to this pull request