* fix: hide empty backlinks, referenced-by, and relations sections
When a note has no backlinks, referenced-by entries, or relations,
the corresponding inspector sections are now completely hidden instead
of showing "No backlinks" / "No references" / "No relationships" labels.
This keeps the inspector clean and focused on actual content.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
* design: add before/after mockup for hide-backlinks-empty
Shows inspector panel comparison: cluttered empty state labels (before)
vs clean hidden sections (after).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
* design: add before/after wireframes for hide-backlinks-empty
---------
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
