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acme-storefront/Fix the double-charge bug in checkout

We're seeing duplicate charges when customers double-click the pay button. Can you find and fix it?

I can reproduce it: the checkout form fires two POST /charges requests when the button is clicked twice before the first response lands. Tracing where the idempotency key should be.

just now

Root cause: createCharge() generates a new idempotency key per call instead of per checkout session, so the gateway treats the second click as a fresh charge. Fixing that and disabling the button while a charge is in flight.

just now

Extra high

acme-dashboard/Add a dark mode toggle to settings

Add a dark mode toggle to the settings page. Should remember the choice and follow the system default until they pick one.

There's already a ThemeProvider wrapping the app but it's hard-wired to light. I'll lift the mode into context, persist it to localStorage, and add a Light / Dark segmented control under Settings → Appearance.

just now

src/theme/ThemeProvider.tsx

10export function ThemeProvider({children}: {children: ReactNode}) {

11+ const prefersDark = useMediaQuery('(prefers-color-scheme: dark)')

12 const stored = localStorage.getItem('theme')

13+ const [mode, setMode] = useState(stored ?? (prefersDark ? 'dark' : 'light'))

15+ useEffect(() => {

16+ localStorage.setItem('theme', mode)

17+ }, [mode])

19 return (

20 <ThemeContext.Provider value={{