Tabbed Inspector with native segmented picker.
- Inspector now has Document and Properties tabs. A native segmented picker with SF Symbol icons (doc / info) splits the panel into a Document tab for file and content stats and a Properties tab for YAML frontmatter, instead of stacking everything in one scrolling list.
- Empty Properties tab shows a placeholder. Documents without frontmatter now display "No YAML frontmatter" filling the available space, so the tab doesn't collapse to nothing.
- Picker matches Apple's pill-style segmented look on macOS 26 Tahoe. Uses
.controlSize(.large)plus.buttonSizing(.flexible)on Tahoe and falls back to.fixedSize()on macOS 15 Sequoia.