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-tanstack/tsconfig.json

@@ -6,7 +6,8 @@
     "baseUrl": ".",
     "paths": {
       "@/*": ["./src/*"]
-    }
+    },
+    "types": ["vitest/globals", "@testing-library/jest-dom"]
   },
   "include": ["src/**/*.ts", "src/**/*.tsx"],
   "exclude": ["node_modules"]