* fix: last block timer
* refactor: update BlockHeader and BlockHeaders to use AugmentedBlockHeader type and add blockTime calculation
* refactor: remove isLast prop from BlockHeader and update BlockHeaders mapping
fix: update label in Summary component from 'target' to 'slot'
fix: improve block time calculation in BlockAuthors context
* refactor: update BlockHeader to accept multiple headers and group by timestamp in BlockHeaders
* refactor: update BlockHeader time formatting and adjust display value units
* refactor: simplify BlockAuthorsCtxRoot by removing blockTime calculation and parent timestamp retrieval
* feat: enhance calcDelay function to handle elastic scaling and distribute delays across blocks
9c1c4ee96f