feat(apps): add unit tests for providers + bind-production + cms config

web-next: bindAllProduction calls all 4 feature binders exactly once;
Providers renders children. web-tanstack: equivalent providers + bind tests.
cms: payload.config exports a SanitizedConfig with all expected collections.

Spec: §6.7, §9

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/web-next/tsconfig.json

@@ -7,7 +7,8 @@
         "./src/*"
       ]
     },
-    "allowJs": true
+    "allowJs": true,
+    "types": ["vitest/globals", "@testing-library/jest-dom"]
   },
   "include": [
     "next-env.d.ts",