This commit introduces a new "Design System" screen for developers and designers, refines navigation animations for a smoother experience, and improves typography consistency across various UI components.
**Key Changes:**
* **feat(Design System):**
* Added a new `DesignSystemScreen.kt` to visually showcase the app's color palette, typography styles, and shape system.
* The screen features animated guides and detailed specifications for each design token (e.g., font size, weight, color roles).
* A new "About Tangyuan Design System" menu item has been added to the `UserScreen` (for both logged-in and logged-out states), navigating to this new screen.
* **refactor(Navigation):**
* Replaced default navigation transitions with custom animations using `CubicBezierEasing` for a more fluid and responsive feel (e.g., quick spring and fade effects).
* Detail screens (`PostDetail`, `UserDetail`, `ImageDetail`) now use a `fadeIn`/`fadeOut` transition to prevent conflicts with shared element animations.
* Side-panel screens (`About`, `DesignSystem`) now use a horizontal slide transition.
* Navigation between main tabs (`Talk`, `Message`, `User`) is now animated with a horizontal slide and fade.
* **refactor(Typography & UI):**
* Standardized the font weight for titles and important text to `SemiBold` across `PostCardItem`, `PostDetailScreen`, and `CommentComponents` for better visual hierarchy.
* Updated the `PostDetailScreen` top bar title to "帖子详情" for clarity.
* Replaced the literary font with the general-purpose font in some UI elements like comment interaction labels for improved readability.
* Enabled image click navigation from the `UserDetailScreen`'s post feed.
* **feat(Create Post):**
* Introduced `CreatePostDto.kt` and `CreatePostRepository.kt` to support post creation.
* The repository now handles fetching categories and creating posts through a two-step process: creating post metadata and then the post body.
* Added `CreatePostState` to manage the UI state for the post creation screen, including validation for content length and image limits.
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