chore: add changeset for ui bundle fix and dev server cleanup

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

Author: zrosenbauer

.changeset/perf-ui-bundle.md

@@ -0,0 +1,8 @@
+---
+'@zpress/ui': patch
+'@zpress/cli': patch
+---
+
+perf: reduce @zpress/ui bundle from 15MB to 767KB by externalizing ts-morph
+
+fix: close Rspress dev server on quit (no more double ctrl+c / blank screen)