This commit introduces a new "Create Post" screen, enabling users to compose and publish posts with text and up to three images. The implementation includes a dedicated ViewModel, robust state management, and an asynchronous image upload flow.
**Key Changes:**
* **feat(Create Post Screen):**
* Added `CreatePostScreen.kt`, a new Composable screen for creating posts.
* The UI includes a text input field, selectors for "Section" and "Category," and an image picker/preview area.
* Implemented `SelectionBottomSheet` as a reusable component for picking sections and categories from a modal bottom sheet.
* The "Publish" button is dynamically enabled based on content validation and image upload status.
* Error messages are displayed to the user via a snackbar-like component.
* **feat(CreatePostViewModel):**
* Created a new `CreatePostViewModel` to manage the logic and state (`CreatePostState`) of the creation process.
* Fetches post categories on initialization.
* Handles image selection and manages an asynchronous upload queue. Each selected image is immediately uploaded to the backend via `MediaRepository`.
* The ViewModel tracks the upload progress for each image and updates the UI accordingly.
* The `createPost` function validates all inputs, compiles the post data (including uploaded image UUIDs), and sends it to the repository.
* **feat(Navigation):**
* Added a `CreatePost` route to the navigation graph (`Screen.kt`).
* Integrated the new screen into `App.kt` with custom horizontal slide transitions.
* The publish button on the main screen's top bar now navigates to the `CreatePostScreen`.
* Upon successful post creation, the user is navigated back to the main screen.
* **refactor(PostDetailViewModel):**
* Adjusted the `createComment` logic to correctly handle `parentCommentId`, sending `0L` instead of `null` when there is no parent comment.
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