* There is a limitation with foreground services — we cannot update a foreground service notification from the background (when the application is not running). Starting with Android 16, foreground services also validate the notification ID to ensure it exists before running; this was not enforced in earlier versions, where it worked fine. When multiple downloads are running in the background and one completes, setting a new notification to the foreground service causes it to stop, which in turn stops all background downloads. Additionally, our foreground service was tied to a specific download ID, so when that download completed, was cancelled, or paused, the service also stopped.
* To fix this, we now show a persistent notification that remains active until all downloads are completed or cancelled. This ensures the foreground service stays active in the background and the network is not suspended while downloads are in progress.
* Refactored the code to use Jetpack Compose UI.
* Removed unused code from the project.
* Fixed: When there is no ZIM file available and navigating to `CustomDownloadFragment` application sometimes crashes.
* Fixed: "Open Library" button was shown even when no readable ZIM file was available.
* Fixed: The `DownloadTest`.
* Fixed: The `uiDevice.pressBack` was not working with compose UI so we have replaced it with `Espresso.pressBack`.
* Fixed: NoteFragmentTest.
* Fixed: Pressing the back button now correctly closes the left drawer when it’s open on the Local Library or Online fragments.
* Introduced: A common mechanism to support back press handling across all fragments and the activity, and added support for "Periodic back navigation".
* Refactored the `DarkModeViewPainterTest` with compose UI.
* Refactored the `CopyMoveFileHandlerTest` according to compose UI.
* Refactored the test cases to get the fragments in test cases according to compose based navigation.
* Refactored the `SearchFragmentTestForCustomApp` test case.
* Removed `kiwix_nav_graph` and `custom_nav_graph`, and refactored the remaining code that depended on them.
* Refactored `HotspotNotificationManager` to use the Compose-based navigation graph instead of the XML one.
* Fixed: When scrolling, the BottomAppBar was appearing behind the navigation buttons.
* Fixed: The hint in the table of contents was not showing on first-time app install.
* Fixed: Pressing the back button was immediately exiting the app when the table of contents drawer was open.
* Created the `CustomNavGraph` for custom app navigation and refactored related code.
* Refactored the logic to dynamically disable the left drawer when a custom app is configured not to show it.
* Simplified the code for enabling/disabling the sidebar.
* Resolved all lint and Detekt errors.
* Fixed: Open library button not working.
* Fixed: opening ZIM file from storage (using the plus button) had too much bottom margin after migrating MainActivity to Compose.
* Added support for automatically hiding and showing the BottomAppBar while scrolling, using the Compose approach.
* Many other improvements in UI and logics.
* Show or hide the BottomAppBar when full screen mode is enabled/disabled or when tabs are visible.
* Disable the left drawer when opening full screen mode, tabs, etc.
* Removed the `DefaultLanguageProvider` since now it is unused according to this new approach.
* Refactored the `SaveLanguagesAndFinishTest` unit test according to this new approach.
* Improved the UI to show the selected language on `OnlineLibrary` screen to inform users which language they have selected for fetching the ZIM files.
* Refactored the code to apply the search filter same like kiwix server.
