fix: implement useUpdateNodeInternals across all node types to resolve connection offset issues on size change

Redesign sticker pin to match the overall dark-neutral aesthetic

Fix overlapping pin heads on CommentNode by integrating Handle styling

Implement beautiful thread connections for stickers with push-pin visuals

feat: move pin toggle onto comment card and remove comment performers

feat: make comments resizable and pinnable, remove ports, and save sizes and frozen states in database

fix: restore original theme color as default for goal nodes, keeping comments yellow by default

feat: add comment sticker notes and custom pastel color picker settings for canvas nodes