build: copy uFuzzy from node_modules at build instead of vendoring it

The python env select popup inlines uFuzzy as a <script> in its HTML
string, so it needs the IIFE build as a file in the packaged app. That
file was committed under src/assets and refreshed by hand through an
update-ufuzzy script, which drifts: #988 bumped @leeoniya/ufuzzy to
1.0.19 but the vendored copy stayed on the old build.

Copy it from node_modules at build time instead, like toolkit.min.js
right above it in copyassets. The pinned dependency is the single source
of truth, the vendored blob and the update-ufuzzy script both go away,
and the drift cannot recur. shx was only used by that script, so it
drops out of devDependencies here too.

Note: AI-assisted (Claude Code). Manually verified by building: build/app-assets/uFuzzy.iife.min.js comes out byte-identical to the 1.0.19 dist, shx is gone from the lockfile with no remaining references, prettier clean, and the e2e suite passes so the popup loads it at runtime.

Author: notluquis

package.json

@@ -53,8 +53,7 @@
     "lint": "yarn && yarn prettier && yarn eslint",
     "lint:check": "yarn prettier:check && yarn eslint:check",
     "prettier": "prettier --write \"**/*{.ts,.tsx,.js,.jsx,.mjs,.cjs,.css,.json,.md}\"",
-    "prettier:check": "prettier --check \"**/*{.ts,.tsx,.js,.jsx,.mjs,.cjs,.css,.json,.md}\"",
-    "update-ufuzzy": "shx cp node_modules/@leeoniya/ufuzzy/dist/uFuzzy.iife.min.js src/assets/"
+    "prettier:check": "prettier --check \"**/*{.ts,.tsx,.js,.jsx,.mjs,.cjs,.css,.json,.md}\""
   },
   "build": {
     "appId": "org.jupyter.jupyterlab-desktop",
@@ -208,7 +207,6 @@
     "prettier": "~2.1.1",
     "read-package-tree": "^5.1.6",
     "rimraf": "^4.4.1",
-    "shx": "^0.4.0",
     "typescript": "^6.0.0",
     "typescript-eslint": "^8.61.1",
     "vitest": "^4.1.9",

scripts/copyassets.js

@@ -67,6 +67,20 @@ function copyAssests() {
     path.join(dest, '../jupyter-ui-toolkit/toolkit.js')
   );
 
+  // Copy uFuzzy from node_modules at build time, like the toolkit above, so the
+  // pinned dependency is the single source of truth and there is no vendored
+  // copy in src/assets to keep in sync by hand.
+  fs.copySync(
+    path.join(
+      srcDir,
+      '../node_modules',
+      '@leeoniya/ufuzzy',
+      'dist',
+      'uFuzzy.iife.min.js'
+    ),
+    path.join(dest, '../app-assets', 'uFuzzy.iife.min.js')
+  );
+
   const envInfoPath = path.join('main', 'env_info.py');
   fs.copySync(path.join(srcDir, envInfoPath), path.join(dest, envInfoPath));