Build a native mobile app called "TrendSpark" designed for creative challenges. The app should be built using React Native and focus on a simple, engaging user experience. The core features are: 1. **User Authentication:** * A simple sign-up and login process using a phone number or a social media provider. * After sign-up, users can create a unique username and find/add friends from their contacts. 2. **Home Screen / Challenge Feed:** * This screen should display the active "Daily Challenge" and "Weekly Challenge." * Each challenge should be presented as a card with the prompt text and an "Accept Challenge" button. * There should be a secondary feed or tab to view popular public submissions for inspiration. 3. **Creation Studio:** * A modal screen that opens when a user accepts a challenge. * It should provide tools relevant to the challenge type (video, image, or text). * **AI Tools:** Integrate simple AI functionalities: * For image challenges: A tool to generate an image from a simple text description. * For photo challenges: A tool to apply a visual filter or style transfer. * For text challenges: A simple text suggestion or completion tool. * Users can create and submit their response to the challenge from this screen. 4. **Friends Feed:** * A dedicated screen that displays a chronological feed of challenge submissions from the user's friends. * Users can react to friends' posts with a predefined set of emojis. Reaction counts are not public. 5. **Profile Screen:** * Displays the user's profile picture, username, and a grid of their past submissions. * Showcases a "Creative Streak" counter that increments for each consecutive day a daily challenge is completed.

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