sync sidebar tree with canvas (entire model)

not sure projections will be present in the hierarchy (to be confirmed).

selection should be synchronised as well

focus on click selection inside the canvas will be handled outside this card, this is only to sync model between canvas and tree.

Start by locating the sidebar tree and canvas components, then trace how the entire model and selection are represented. Confirm whether projections belong in the hierarchy and clarify the boundary around canvas click selection. Done means the tree and canvas stay synchronized for the agreed model and selection behavior.

Written by the indexing model from the issue text.