chore: add changeset for decompose-to-ui-kit feature

Closes Phase 1 of #225.

Signed-off-by: homen <hshum2018@gmail.com>

Author: HomenShum

.changeset/decompose-to-ui-kit.md

@@ -0,0 +1,9 @@
+---
+"@open-codesign/core": minor
+"@open-codesign/desktop": minor
+"@open-codesign/i18n": patch
+---
+
+Add **Decompose to UI Kit** — one-click in the chat sidebar emits a `ui_kits/<slug>/` folder shaped for coding-agent handoff (`index.html` + `components/*.tsx` + `tokens.css` + `manifest.json` + `README.md`). Built-in deterministic + vision verifiers self-check parity using a 12-question boolean rubric (`parityScore = passCount / totalChecks`, no LLM-fabricated floats) and re-iterate on gaps. Per-decompose cost surfaces inline as a toast.
+
+Closes Phase 1 of #225.