* Refactored all `RxJava` code in `SharedPreferenceUtil` to coroutines.
* Refactored `RxJava` code to coroutines in `Fat32Checker`.
* Refactored `RxJava` code to coroutines in `DarkModeConfig`.
* Refactored all related code of these classes accordingly.
* Updated unit test cases to work with coroutines.
* Refactored the IP address polling logic using coroutine Flow. Now the IP check runs on the IO thread and the result is pushed to the main thread, because our callbacks need to work on the main thread. Also, this whole operation will automatically cancel if the user switches the screen or if the given coroutine scope gets cancelled, since the scope is lifecycle-aware. This helps to avoid using extra resources unnecessarily.
* Added clear and concise method-level comments to improve code readability and help others easily understand the purpose and behavior of each method.
* Removed duplicate method in `DownloadRoomDao` for fetching all downloads.
* Refactored `DownloadManagerMonitor` to use `Coroutines` instead of `RxJava`.
* Improved coroutine usage in `DownloadMonitorService`.
* Updated `LanguageViewModel` to use `Coroutine Flows` instead of `RxJava`.
* Refactored `NewLanguagesDao` to expose Coroutine Flows instead of `RxJava` observables.
* Updated `SaveLanguagesAndFinish` to use coroutines instead of `RxJava`.
* Created a `FlowExtension` utility class to add custom flow-related extensions. In this PR, added the `collectSideEffectWithActivity` extension function, which allows collecting `SideEffects` and handling them with the current Activity in a Compose UI. This also moved the `SideEffect` collection from the Fragment layer to the Compose screen, improving separation of concerns.
* Refactored the unit test cases according to this change.
* Created an `asFlow` extension function to convert ObjectBox queries into coroutine Flow, enabling easier migration to coroutine-based flows in future tasks.
* Refactored all related code to use coroutine Flow.
* Updated all test cases to align with the new coroutine-based implementation.
* Migrated ZIM content loading logic from RxJava to Kotlin coroutines.
* The previous implementation used `RxJava` to stream content on the IO thread, but it was not lifecycle-aware. This caused the task to continue running even when the WebView navigated away or stopped rendering.
* Updated the implementation to use coroutines, ensuring that the task is lifecycle-aware and automatically cancels when the page changes or the user navigates away.
* This improves resource efficiency and prevents unnecessary background work during page transitions.
* Refactored `StartMultiSelection` to use coroutines instead of RxJava.
* Refactored `fileSelectActions` to use coroutines instead of RxJava.
* Refactored the `updateBookItems` to use coroutines instead of `rxJava`.
* Refactored `LocalLibraryFragment` to use coroutine flows instead of RxJava code.
* Improved the test code to validate coroutine flows.
* Refactored the `NewRecentSearchDaoTest` according to new flow test code.
* Refactored the `StorageObserverTest`.
* Refactored the `SearchViewModelTest`.
* Refactored the `FileSearchTest`.
* Improved `AlertDialogShower` to support bottom padding for customView, allowing design customization from the caller side.
* Removed unused code from the project.
* Refactored the UI, and unit test cases.
* Fixed: The online library download progress bar was not initially visible when the fragment was created.
* Refactored all UI test cases to align with the new Compose UI.
* Created an extension function for composeTestRule to wait for a specified duration until the UI becomes visible. This is similar to BaristaSleepInteractions. Since Compose does not provide a built-in wait mechanism, this custom implementation helps stabilize UI test cases.
* Added `hideKeyboardOnLazyColumnScroll` extension function to hide the keyboard when scrolling a `LazyColumn`.
* Fixed: "Downloading library" message was not centered properly.
* Fixed: Unnecessary top margin appeared when the search view was active.
* Fixed: Search view did not display the entered text.
* Fixed: Search view did not restore the previously searched books when the device woke from sleep.
* Fixed: Search view did not close on back button press, causing previous search results to remain visible.
* Fixed: Various minor UI issues found while testing.
* Removed the unused code from project.
* Created `OnlineLibraryScreenState` to manage the UI state.
* Enhanced `ContentLoadingProgressBar` to allow setting the width of the circular progress bar from the calling site, enabling more flexible styling based on design requirements.
* Added `DownloadBookItem` composable for displaying download progress.
* Refactored `BookItem` by splitting the code into smaller, reusable composables, as several UI elements are shared across downloading, online, and downloaded books.
* Created OnlineBookItem for displaying online books.
* Created the `NavigationHistoryDialogScreen` using our app theme.
* Refactored the code according to comose UI.
* Refactored the UI test cases according to compose UI.
* Removed the unused code from project.
* Created a reusable `StorageDeviceItem` composable, which will also be used on the settings screen.
* Refactored the code to use the new Compose-based UI.
* Updated the UI test cases to align with the Compose implementation.
* Removed unused code from the project.
* Fixed: `IntroFragmentTest`, `KiwixSettingsFragmentTest`, and `KiwixSplashActivityTest`.
* Resolved memory leaks in `IntroFragment` and `LanguageFragment`.
* Improved the `IntroScreen` code to fix lint errors.
