* The `BackHandler` of top-level destination fragments was always active, preventing the `MainActivity` handler from being called because the top-level fragment's back handler consumed the back event. As a result, when the back stack was empty, pressing the back button did not exit the application.
* We now dynamically enable the `BackHandler` only while a fragment can handle the back event. Once the fragment has handled it, the handler is disabled so that `MainActivity` can process the back event.
* Cause: The request object emitted after user confirmation was identical to the previous one, so the flow collector skipped it and the fetch was never triggered.
* Solution: Added a `System.nanoTime()` field to the request to ensure a unique emission while still preserving existing values.
* Refactored the `updateOnlineLibraryFilters updates onlineLibraryRequest` according to this new change.
* Fixed: When launching the app fresh (cold start), the search screen could appear before the ZIM file was ready (because ZIM file loading in the reader happens on the IO thread), resulting in no search results. Now, incoming actions are delayed until the ZIM file finishes loading so that search works correctly.
* Fixed: Multiple fragment instances were created when repeatedly opening different fragments via bottomAppBar buttons, causing the back button to bring them to the foreground one by one instead of expected behavior.
* NavBackStackEntry arguments are immutable, so switching to `FIND_IN_PAGE` used arguments from the previous ReaderFragment backstack entry.
* Fixed by popping the old ReaderFragment from the backstack and launching a fresh instance with the new search arguments.
* Fixed: Multiple `SearchScreen` instances showing when repeatedly opening the search screen.
* Fixed: Reader screen showing an older ZIM file after opening a new one and pressing back.
* Refactored `SearchInPreviousScreenTest` according to the new changes.
* Minor improvement in navigation.
* 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.
