List view rows (home, addressDetail, addressToken) should only be clickable
as a whole to navigate to the detail view. Click-to-copy on individual
elements belongs only in the transaction detail view.
Reverts timestamp click-to-copy changes in list views per review feedback.
Keeps blockNumberHtml() and detail-view timestamp changes.
Adds click-to-copy (copies ISO date string) to timestamp displays in:
- home view (relative time ago)
- addressDetail view (relative time ago)
- addressToken view (relative time ago)
- transactionDetail view (full ISO date)
All timestamps now show dashed underline to indicate copyability,
matching the existing UX pattern for addresses, tx hashes, and
block numbers.
Block numbers are blockchain entities like addresses and tx hashes. They now
receive the same treatment: click-to-copy and an external link icon pointing
to etherscan.io/block/{number}.
Closes#99
