This commit enhances the post detail and creation flows by integrating user authentication and activating the post creation functionality.
**Key Changes:**
* **refactor(PostDetailViewModel):**
* The `loadPostDetail` function no longer requires `userId` as a parameter. It now retrieves the current user's ID directly from the JWT using `TokenManager`.
* When creating a new comment (`CreateCommentDto`), the current `commentDateTime` (using `java.util.Date`) is now included.
* **feat(PostViewModel):**
* The previously stubbed `createPost` function has been fully implemented.
* It now makes sequential repository calls: first to `createPostMetadata` to get a new `postId`, and then to `createPostBody` with that ID.
* The UI state is updated to reflect success or failure throughout the creation process.
grtsinry43
c5ec5b1a0b
