- Implement backend tag tree endpoint at /tags/tree with TagTreeNode and
TagTreeResponse models
- Add frontend tag tree decryption logic and wire it into notes
decryption flow
- Fetch and decrypt tag tree in tags.tsx; integrate with tag store
- Add UI toggle for folders vs tags and update Sidebar and Header
- Add a ZIP-based import page that builds a folder/note tree from a ZIP
and creates items via the API
- Introduce collapsible folder UI with RenderFolder and updates to
DroppableFolder to support collapsing
- Wire a new /import route into App and add jszip as a frontend
dependency
