test: update type declaration assertions for generated d.ts files

Fix test assertions to match updated TypeScript declaration format generated by tsup. Updates expectations for function declarations, constant exports, and UMD bundle structure in build artifact tests. Also enables DTS generation for CLI build and improves test code formatting.

<!-- ps-id: 819eb0d5-f3aa-4133-a8b1-d5de3f6862e7 -->

Author: cawalch

.github/workflows/nodejs.yml

@@ -18,7 +18,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [18.x, 20.x, 22.x, 23.x]
+        node-version: [20.x, 22.x, 23.x, 24.x]
 
     steps:
     - name: 📚 checkout

biome.json

@@ -1,5 +1,5 @@
 {
-  "$schema": "https://biomejs.dev/schemas/2.0.6/schema.json",
+  "$schema": "https://biomejs.dev/schemas/2.3.2/schema.json",
   "vcs": { "enabled": false, "clientKind": "git", "useIgnoreFile": false },
   "files": { "ignoreUnknown": false, "includes": ["**", "!**/dist", "!**/coverage", "!**/test/compliance"] },
   "formatter": {