305c3fd97b
Scroll: MUI only locks <body>, but base.css 'html{overflow-x:hidden}' makes <html> the vertical scroller (overflow-x:hidden forces overflow-y:auto), so the page scrolled behind modals. Added a ref-counted useDialogScrollLock that locks <html> (with scrollbar-width padding) + disableScrollLock on the kit dialogs. Labels: Modal now freezes title/subtitle/submitText while closing (derive-state-from-props), so editing then saving no longer briefly flashes the 'create' title/button during the fade-out.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>