feat(comments): fold the drawer and update the heading count on add

Adding a comment left three rough edges. Its property drawer rendered expanded while every other drawer in the page was folded, so I fold the new subtree's drawers right after inserting it. The Comments heading's count went stale on add: a freshly created subtree now shows 💬 Comments 1/1, and an existing 💬 Comments N/M bumps to N+1/M+1. And the fallback that creates the Comments subtree when an issue had none was still inserting a glyph-less "Comments". It now leads with the 💬 like the rest.

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