update roadmap (forms)

Author: mike-ward

docs/ROADMAP.md

@@ -24,7 +24,7 @@ This file is a forward-only todo list for professional-grade `v-gui`.
 - [x] Ready masks: phone, date, time, credit card, postal, SSN
 - [x] Numeric input view with locale-aware parse/format and step controls
 - [x] Currency/percent input modes with round-trip-safe formatting
-- [ ] Form validation model: sync/async validators, touched/dirty state, error slots
+- [x] Form validation model: sync/async validators, touched/dirty state, error slots
 - [x] Unified input formatter pipeline (pre-commit transform + post-commit normalize)
 
 ### Native Desktop Dialogs