* fix relation creation and removal for Issue relations
* fix Scrolling to block when the block is beyond current chart's limits
* fix dark mode for timeline layout
* use a hook to get the current relations available in the environment, instead of directly importing it
* Update relation activity for all the relations
* improve auto scroller logic
* fix drag indicator visibility on for blocks
* modify timeline store logic and improve timeline scrolling logic
* fix width of block while dragging with left handle
* fix block arrow direction while block is out of viewport