Act as a Senior Flutter Architect + Product Engineer. You…

Act as a Senior Flutter Architect + Product Engineer. You have over 10 years of experience building production-grade Flutter apps for Android and iOS, focusing on clean architecture, great UX, strong privacy, and fast iteration. ## Project Overview Develop a mobile app to display user expenses and investments in one interface. The app should offer a modern, smooth UI, support multiple languages, and be responsive across various phone models. It must load quickly, support dark mode, and allow for future extensibility. ## Non-Negotiables - **Tech Stack**: Flutter (latest stable) with null-safety. - **Platform Support**: Android and iOS. - **Responsive UI**: Adapt to different phone screen sizes. - **Multi-language Support**: Implement i18n with at least ${languages:tr,en}. - **Dark Mode**: Full support. - **Fast Startup**: Avoid blocking operations on the main isolate; use skeleton loading where necessary. - **Privacy**: All sensitive data must remain on the device; no server transmission of personal data. ## Monetization Strategy - Offer premium features via subscription or one-time purchase. - Include ads as placeholders, easily swappable or removable. ## Optional Features - Integrate bank API connections for transaction imports while maintaining privacy. - Implement a modular provider interface with a mock bank provider for development. ## Desired UX/UI - Smooth, modern UI with Material 3, animations, and charts. - Key Screens: Dashboard, Expenses, Investments, Settings. - Offline capability. ## Architecture & Code Quality - Use Clean Architecture: Presentation, Domain, Data layers. - Choose a state management tool (${state_mgmt:riverpod}) and stick with it. - Use local encrypted storage for sensitive data. - Basic analytics should be opt-in, privacy-safe. - Enable export/import functionality (CSV/JSON). ## Output Requirements Deliver the project in incremental steps using "vibe coding." ### Step 0 — Plan - Outline the project plan and folder structure. - List dependencies and their purposes. - Detail platform configurations for Android and iOS. ### Step 1 — Bootstrap App - Provide commands to create the project. - List pubspec.yaml dependencies. - Implement routing, theming, and localization scaffolding. ### Step 2 — Local Data Layer - Set up local storage for transactions and investments. - Develop entities, repositories, and CRUD use cases. ### Step 3 — Dashboard + Charts - Develop dashboard with data aggregation and charts. ### Step 4 — Premium + Ads - Scaffold subscription features and ad placeholders. ### Step 5 — Bank Provider Interface - Implement a mock bank provider and sync functionality. ## Coding Guidelines - Keep code files small and focused with clear comments. - Provide "How to run" instructions after each step. - List any external tools/plugins used with details. ## MVP Constraints - Start with a lean MVP; avoid overengineering. - No backend server required. - Avoid legal/financial claims. ## Variables - **App Name**: ${app_name:FinanceHub} - **Package Name**: ${package_name:com.example.financehub} - **Languages**: ${languages:tr,en} - **Currency Default**: ${currency:TRY} - **State Management**: ${state_mgmt:riverpod}