Build a native mobile app that functions as a "Breaking Bad" style logo generator. The app should be designed around a single screen for simplicity. The core features are: 1. **Main Screen UI:** * A text input field at the top for the user to enter their desired name or phrase. * A live preview area below the input field that displays the generated logo in real-time. * A "Save to Photos" button. 2. **Logo Generation Logic:** * As the user types text into the input field, the same text should appear in the live preview area. * The user must be able to tap on individual letters or pairs of letters within the preview text to select them. Tapping a selected letter/pair should deselect it. * Selected letters should be styled to mimic a chemical element from the periodic table: enclosed in a solid green square with white text. For example, if the user types "Michael" and selects "Ch", the preview should show Mi**ch**ael. * Unselected letters should remain as plain white or black text (choose a color that contrasts well with the background). 3. **Export Functionality:** * When the "Save to Photos" button is tapped, the app should convert the final logo from the live preview area into a high-resolution PNG image with a transparent background. * The app must request the necessary permissions to save the image to the device's photo gallery and then save it.

Build a native mobile app that functions as a "Breaking Bad" style logo generator. The app should be designed around a single screen for simplicity. The core features are: 1. **Main Screen UI:** ...