Feat/row

[techgirly77]

Completed! ✅

Implemented a copy-to-clipboard action for transaction hashes displayed in event entries.

Changes Made

• Added a copy action beside transaction hashes.
• Added visual feedback to confirm when a hash has been successfully copied.
• Added graceful fallback/error handling for browsers where Clipboard API access is unavailable or fails.
• Preserved the full transaction hash so users can still access and copy the complete value.
• Added/updated tests covering successful copies and clipboard failures.

Validation

• ✅ Transaction hashes have a dedicated copy action.
• ✅ Successful copying provides clear visual feedback.
• ✅ Clipboard failures are handled without breaking the event list.
• ✅ Full transaction hashes remain accessible.
• ✅ Copy functionality tests pass.

closes #605

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