feat(courses): integrate course API with offline-first pagination

[Gowreesh-A-M]

• Add ApiClient and ApiException for centralized HTTP handling
• Implement HttpDataSource.getCourses with page/page_size params
• Add PaginatedResponseDto to handle paginated API responses
• Update CourseRepository to track pagination state via API next field
• Add courseInitialSync provider, auth-gated and session-aware
• Show full-screen loader only on first visit with empty cache
• Show bottom pagination loader while fetching subsequent pages

[gemini-code-assist]

Summary of Changes

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This pull request significantly upgrades the Study tab by integrating a real course API, moving away from static mock data. It establishes a robust offline-first architecture with efficient pagination, ensuring a smooth user experience even with large datasets or intermittent connectivity. The changes include a new centralized networking layer, refined loading state management, and an updated data model to support richer course information.

Highlights

• Real Course API Integration: The Study tab now fetches and displays live course data from the Testpress API, replacing static mock data. This is implemented with an offline-first approach, persisting data to a local Drift DB.
• Offline-First Pagination: Courses are loaded incrementally with API-driven pagination. The UI supports infinite scrolling, fetching subsequent pages as the user approaches the end of the list.
• Centralized Networking & Error Handling: Introduced ApiClient for all HTTP communication, wrapping Dio and automatically attaching Authorization headers. ApiException provides standardized error handling for network requests.
• Dynamic Loading States: Improved user experience with loading indicators: a full-screen loader appears only on the very first visit when the cache is empty, while subsequent visits display cached data instantly. A small bottom spinner indicates ongoing pagination fetches.
• Course Repository Enhancements: The CourseRepository now manages pagination state (_nextPage, _hasMore, _isSyncing) and includes a callback for sync state changes. It also handles upserting paginated results into the local database.
• Course Image Support: The CourseDto and CoursesTable in the local database have been extended to include an image field, allowing course cards to display images fetched from the API.

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[gemini-code-assist]

Code Review

This pull request refactors the Study tab to integrate a real backend API for course data, transitioning from static mock data to an offline-first, paginated approach. Key changes include the introduction of ApiClient and ApiException for centralized HTTP communication with JWT authentication, and an updated HttpDataSource that fetches paginated course data. The data layer is enhanced with a new PaginatedResponseDto model and the CourseDto and local Drift database (CoursesTable) now support an image field, with the database schema version incremented. The CourseRepository is refactored to manage pagination state and supports incremental fetching, persisting data locally, and providing sync state callbacks. The StudyScreen is updated to use a CustomScrollView with a ScrollController for infinite scrolling, displaying appropriate loading indicators for initial fetches and pagination. Course cards are also enhanced to display fetched course images, with a fallback to a default icon. The application configuration now defaults to using the real HTTP data source.