Backlinks Panel and Split Panes — pyrite

Backlinks Panel:

Sidebar panel showing all entries that link to the current entry

Uses existing `/api/entries/{id}` backlinks data

Each backlink shows title, snippet of linking context, entry type

Click to navigate

Split Panes:

CSS Grid-based resizable split pane component

Two entries side-by-side, or editor + preview

Drag handle for resizing

Keyboard shortcut to toggle split

These complete the Phase 2 "knowledge tool" feel — users can see connections and work with multiple entries simultaneously.

Backlinks Panel and Split Panesbacklog_item