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/search-doc-to-lora.ts

@@ -0,0 +1,21 @@
+import { Scenario } from '../types';
+
+export const scenario: Scenario = {
+  id: 'search-doc-to-lora',
+  name: 'Search Doc-to-LoRA',
+  description: 'Free-text graph search should find the Doc-to-LoRA node by title without speculative dimension constraints or unnecessary web search.',
+  categories: ['search'],
+  tools: ['queryNodes'],
+  input: {
+    message: 'Find the recent Doc-to-LoRA stuff in my graph. Just return the matching graph node or nodes.',
+  },
+  expect: {
+    toolsCalledSoft: ['queryNodes'],
+    toolsNotCalled: ['webSearch'],
+    responseContains: ['Doc-to-LoRA: Learning to Instantly Internalize Contexts'],
+    maxLatencyMs: 15000,
+    maxTotalTokens: 8000,
+    maxEstimatedCostUsd: 0.08,
+  },
+  notes: 'Regression for the failure where free-text search was over-constrained by guessed dimensions and missed the existing Doc-to-LoRA node.',
+};