Make block-embeds tracable like block references

[yifanyin]

Currently, if a block is referenced, the counter on the right shows the number of references. Clicking the counter will pop the zoom-in view of that block in the right sidebar and the "Linked References" below it.

However, when a block is embedded, no counter and thus no linked references are produced, making the embeds not traceable at all. I feel it is a bit counter-intuitive. I'd like to suggest having the block embeds treated the same as block references.