Generate UI Copy for App Screens

Generate UI copy for the following app screens for [APP NAME], a [APP DESCRIPTION] app.

For each screen, write: the main headline (under 8 words), a supporting subheadline (under 15 words), the primary CTA button text (2-4 words), and any helper text or microcopy needed. Screens to cover:

1) Onboarding welcome screen,
2) Empty state (no data yet),
3) Error state (something went wrong),
4) Success state (action completed),
5) Paywall or upgrade prompt. Tone: [TONE, e.g. friendly and encouraging / professional and clear]. Avoid generic phrases like "Get started" or "Learn more."