docs: update documentation for v0.4.0 release

- Update README.md with v0.4.0 features and screenshots placeholders
- Update architecture.md with v0.4.0 implementation status
- Update progress.md marking all 27 tasks as completed
- Create CHANGELOG.md with complete release notes
- Add v0.4.0 frontend components and hooks

frontend/src/components/ui/dropdown-menu.tsx

@@ -11,7 +11,10 @@ const DropdownMenu = React.forwardRef<
     <div ref={ref} {...props}>
       {React.Children.map(children, (child) =>
         React.isValidElement(child)
-          ? React.cloneElement(child as React.ReactElement<any>, {
+          ? React.cloneElement(child as React.ReactElement<{
+          open?: boolean;
+          setOpen?: (open: boolean) => void;
+        }>, {
               open,
               setOpen,
             })