docs(primevue): add anti-pattern note for responsive utility wrapping

dev-docs/PRIMEVUE_COMPONENTS.md

@@ -370,6 +370,8 @@ sane:
 6. **When in doubt, prefer PrimeVue conventions.** If a form on a migrated surface needs a component this document doesn't yet cover, find the closest PrimeVue equivalent on https://primevue.org/, implement it, and append a note in §3 (or open a tightly scoped PR to update this document). F4 sub-packages are expected to refine §3 — that is the explicit growth path.
 7. **F6 is the cliff.** After F6 (cleanup, ~0.5 day), Vuetify is removed from `package.json` and `<V*>` tags fail to compile. No more parallel mode. Per [RFC §9](./RFC-WS-FRONTEND-PRIMEVUE.md#9-rollback-plan), F6 is the point of no return for rollback.
 
+Anti-pattern: directly applying responsive visibility utility classes (md:hidden, lg:flex, etc.) to PrimeVue components. PrimeVue's component CSS may override due to cascade order. Always wrap in a plain element that owns the visibility class.
+
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 ## 10. Cross-references and resources