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

tests/evals/scenarios/index.ts

@@ -1,6 +1,7 @@
 import { scenario as focusedGraphWrite } from './focused-graph-write';
 import { scenario as skillGuidedWrite } from './skill-guided-write';
 import { scenario as nodeIndexSearch } from './node-index-search';
+import { scenario as searchDocToLora } from './search-doc-to-lora';
 import { scenario as chunkQuoteInsight } from './chunk-quote-insight';
 import { scenario as hubTraversal } from './hub-traversal';
 
@@ -8,6 +9,7 @@ export const scenarios = [
   focusedGraphWrite,
   skillGuidedWrite,
   nodeIndexSearch,
+  searchDocToLora,
   chunkQuoteInsight,
   hubTraversal,
 ];