fix(web): align @next/bundle-analyzer version with lockfile

package.json requested ^15.5.15 but pnpm-lock.yaml had ^16.2.3,
breaking container startup under --frozen-lockfile.

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

apps/web/package.json

@@ -49,7 +49,7 @@
     "zod": "^3.23.8"
   },
   "devDependencies": {
-    "@next/bundle-analyzer": "^15.5.15",
+    "@next/bundle-analyzer": "^16.2.3",
     "@axe-core/playwright": "^4.11.1",
     "@capakraken/eslint-config": "workspace:*",
     "@capakraken/tsconfig": "workspace:*",