v0.4.1

What's new

• Component(*children, **props): children can now be passed as positional args to __init__, removing the need for a __call__ step when only children are needed.
• App(root, page_title=...): one-step App creation replaces the old App(page_title=...)(root) two-step pattern.
• README intro rewritten: cleaner comparison example (persistent greeting, no try/finally), updated instantiation docs.
• All examples and docs updated to new style.

Full changelog: CHANGELOG.md