docs(frontend): the canonical table and the ui README name the module shape; adding a page is written down

CLAUDE.md gains the header-content, module-store and saved-views rows. docs/development.md says what a
new page is and which tests hold it. components/ui/README.md names every file in the directory, and a
contract test keeps it that way: seventeen had slipped in unlisted. copyItems' comment still claimed it
was a feature file.

frontend/src/components/ui/copyItems.tsx

@@ -10,7 +10,8 @@ import { type ActionMenuItem } from "./ActionMenu";
 // finger cannot select is copied from here. One builder, so every object says it the same way and
 // the clipboard write always runs inside the gesture (`inGesture`, which Safari insists on).
 //
-// A feature file, not `ui/`: it speaks the app's notifications.
+// Domain-free: it speaks through lib/notifications, the platform's toast service, so any module's menu
+// can end with it.
 
 type Named = "title" | "name";