fix(dashboard): resolve @nous-research/ui path under npm workspaces

The sync-assets prebuild step shelled out to 'cp -r
node_modules/@nous-research/ui/dist/fonts ...' with a path relative
to apps/dashboard/. That works only when the dep is installed
locally in the dashboard workspace, but 'npm install' at the repo
root (the documented setup — see apps/desktop/README.md) hoists
shared deps to the root node_modules under npm workspaces. The
relative cp then fails with 'No such file or directory', sync-assets
exits 1, the Vite build aborts, and 'hermes dashboard' surfaces a
generic 'Web UI build failed' message.

Replace the shell one-liner with scripts/sync-assets.cjs, which
walks up from the dashboard directory looking for node_modules/
@nous-research/ui — working in both the hoisted (workspaces) and
co-located (standalone) layouts. Also guards against a missing
dist/fonts or dist/assets with a clearer error pointing at a
rebuild of the UI package rather than silently copying nothing.

apps/dashboard/package.json

@@ -4,7 +4,7 @@
   "version": "0.0.0",
   "type": "module",
   "scripts": {
-    "sync-assets": "rm -rf public/fonts public/ds-assets && cp -r node_modules/@nous-research/ui/dist/fonts public/fonts && cp -r node_modules/@nous-research/ui/dist/assets public/ds-assets",
+    "sync-assets": "node scripts/sync-assets.cjs",
     "predev": "npm run sync-assets",
     "prebuild": "npm run sync-assets",
     "dev": "vite",

apps/dashboard/scripts/sync-assets.cjs

@@ -0,0 +1,46 @@
+#!/usr/bin/env node
+/**
+ * Copy font and asset folders from @nous-research/ui into public/ for Vite.
+ *
+ * Locates @nous-research/ui by walking up from this script looking for
+ * node_modules/@nous-research/ui — works whether the dep is co-located
+ * (non-workspace layout) or hoisted to the repo root (npm workspaces).
+ */
+const fs = require('node:fs')
+const path = require('node:path')
+
+const DASHBOARD_ROOT = path.resolve(__dirname, '..')
+
+function locateUiPackage() {
+  let dir = DASHBOARD_ROOT
+  const { root } = path.parse(dir)
+  while (true) {
+    const candidate = path.join(dir, 'node_modules', '@nous-research', 'ui')
+    if (fs.existsSync(path.join(candidate, 'package.json'))) {
+      return candidate
+    }
+    if (dir === root) break
+    dir = path.dirname(dir)
+  }
+  throw new Error(
+    '@nous-research/ui not found. Run `npm install` from the repo root.'
+  )
+}
+
+const uiRoot = locateUiPackage()
+const distRoot = path.join(uiRoot, 'dist')
+
+const mappings = [
+  ['fonts', path.join(DASHBOARD_ROOT, 'public', 'fonts')],
+  ['assets', path.join(DASHBOARD_ROOT, 'public', 'ds-assets')],
+]
+
+for (const [srcName, destPath] of mappings) {
+  const srcPath = path.join(distRoot, srcName)
+  if (!fs.existsSync(srcPath)) {
+    throw new Error(`Missing ${srcPath} in @nous-research/ui — rebuild that package.`)
+  }
+  fs.rmSync(destPath, { recursive: true, force: true })
+  fs.cpSync(srcPath, destPath, { recursive: true })
+  console.log(`synced ${path.relative(DASHBOARD_ROOT, destPath)}`)
+}