fix: align pnpm-workspace.yaml overrides with package.json specifiers

The CI frozen-lockfile check was failing because pnpm-workspace.yaml
overrides had older version specifiers than package.json. Update overrides
for sharp, postcss, and @types/react-dom to match, and regenerate lockfile.

pnpm-workspace.yaml

@@ -56,12 +56,12 @@ overrides:
   uuid: "^11.1.0"
   fast-uri: "^3.1.3"
   "@hono/node-server": "^1.19.13"
-  postcss: "^8.5.25"
+  postcss: "^8.5.26"
   tmp: "^0.2.6"
-  sharp: "^0.35.3"
+  sharp: "^0.35.4"
   brace-expansion: "^5.0.8"
   "@types/react": "19.2.18"
-  "@types/react-dom": "19.2.4"
+  "@types/react-dom": "19.2.5"
   # Tijdelijke mitigatie voor drizzle-kit audit
   esbuild: "^0.25.9"