feat: sync pane workspace overhaul from private repo

- ship the expanded left-nav and pane header workspace updates
- add dimension-driven browse flow, map view upgrades, and delete-node tooling
- expand eval coverage and refresh the public UI docs for the new layout

Generated with Codex

src/services/database/nodes.ts

@@ -8,7 +8,8 @@ type NodeSearchRow = NodeRow & { rank?: number; similarity?: number };
 
 function sanitizeFtsQuery(input: string): string {
   return input
-    .replace(/['"()*:^~{}[\]]/g, ' ')
+    .toLowerCase()
+    .replace(/[^a-z0-9\s]+/g, ' ')
     .trim()
     .split(/\s+/)
     .filter(word => word.length > 0 && !/^(AND|OR|NOT|NEAR)$/i.test(word))