This commit introduces a significant redesign of the `UserDetailScreen`, transforming it from a simple card-based layout to a more modern and refined profile view. It also replaces the basic list of user posts with a full-featured `PostCardItem` feed.
**Key Changes:**
* **feat(UserDetailScreen):**
* Redesigned the user profile section with a cleaner, borderless layout, moving from a `Card` to a `Column`-based design.
* Enhanced user info display to include email and location as decorative "pills."
* Replaced the previous list of post metadata with a full `PostCardItem`-based feed, showing complete post content directly on the user's profile.
* Added loading skeletons for the profile and post list, as well as an improved empty state for users with no posts.
* Added a "bottom indicator" to signify the end of the post list.
* **refactor(ViewModel):**
* Modified `UserDetailViewModel` to fetch and construct full `PostCard` objects for the user's posts, instead of just `PostMetadata`.
* This involves fetching `PostBody` and `Category` details for each post to provide a rich feed experience.
* **refactor(Shared Element Transition):**
* Introduced `sharedElementPrefix` to `PostCardItem` and `UserDetailScreen` to create unique transition keys for elements (like avatars and names) that appear in multiple screens (e.g., `talk_post_...`, `userdetail_post_...`).
* This ensures that shared element animations are correctly scoped and avoids conflicts when navigating between different feeds and detail screens.
* The shared element transition for user avatar and name now works correctly from any `PostCard` to the `UserDetailScreen`.
* **feat(Repository):**
* Added `getPostBody(postId)` and `getCategory(categoryId)` methods to `UserRepository` to support fetching the detailed data required for constructing `PostCard` objects.
This commit introduces a comprehensive set of features, establishing the core functionality of the application using an MVVM architecture with Hilt for dependency injection.
**Key Changes:**
* **UI & Navigation:**
* Implemented navigation between the main feed, post details, and login screens using Jetpack Navigation Compose.
* Added `TalkScreen` for displaying a feed of posts and `PostDetailScreen` for viewing individual posts and their comments.
* Created a `LoginScreen` with input fields and authentication logic.
* Introduced `PostCardItem` and `CommentItem` Composables for a consistent and reusable UI.
* Added shared element transitions for a smoother user experience when navigating to post details.
* **Architecture & State Management:**
* Integrated Hilt for dependency injection across ViewModels and Repositories.
* Created ViewModels (`TalkViewModel`, `PostDetailViewModel`, `UserViewModel`, `CommentViewModel`, etc.) to manage UI state and business logic.
* Implemented Repository pattern for abstracting data sources from the backend API.
* Defined UI state data classes to ensure a predictable and observable state flow.
* **Data & Models:**
* Introduced data models for `PostCard` and `CommentCard` to aggregate and display complex data structures.
* Added `PostDetailRepository` to orchestrate fetching of post and comment data concurrently.
* Refined DTOs, such as `CreateCommentDto`, for API interactions.
* **Dependencies & Tooling:**
* Added Hilt, Navigation Compose, and Lifecycle ViewModel dependencies.
* Included the `pangu-jvm` library for improved text formatting with spacing between Chinese and English characters.
