- Added a "News" tab to the main index screen.
- Implemented API parameters for fetching news-specific posts: `imageTag`, `search`, `advancedSearch`, `newsFilter`, `onlyNews`, `newsSource`, `newsLanguage`, `newsCategory`, `requireImageCache`.
- Updated `Moment` data class and `MomentEntity` to include news-related fields like `isNews`, `newsTitle`, `newsUrl`, etc.
- Created `News.kt` composable and `NewsViewModel.kt` to display and manage news items.
- Updated `MomentLoader` to include a `newsOnly` parameter for fetching only news items.
- Added Japanese translations for new index tab strings: "Worldwide", "Dynamic", "Following", "Hot", and "News".
- Adjusted tab count and layout based on guest/logged-in user status to accommodate the new "News" tab.
AllenTom
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