Create a native mobile app called "MuseAI" that allows users to generate motivational posters using AI.
The app should have the following features:
1. **Home Screen (Generator):**
* Display a large, prominent button labeled "Generate Poster."
* When the user taps this button, the app should call an AI to generate a unique background image and a related motivational quote.
* Combine the generated image and text into a single "poster" image and display it to the user.
2. **Poster Display Screen:**
* After generation, show the final poster image.
* Include two clear buttons below the poster: "Save to Device" and "Share."
* Include a third button, "Save to My Gallery," which saves the poster data to the user's account in the database.
3. **My Gallery Screen:**
* This screen should display a grid of all the posters the current user has previously saved.
* Tapping on a poster in the gallery should open it in a full-screen view, where they can choose to share or delete it.
The design should be modern, clean, and inspiring. All user-generated posters saved to the gallery should be stored persistently in a database and linked to the user's account.
