General improvments (#114)

* Add "Keep Screen On" feature to PDF and Epub readers.

* Add `rawLibraryFiles` to `MainViewModel` and improve file path resolution in `SharedComposables`.

Specifically:
- Updated `MainViewModel` state and UI logic to track and provide unfiltered library files.
- Enhanced file path formatting in `SharedComposables` to better handle Document, Tree, and primary storage URIs.
- Added scrollable support for long text values in `DetailItem` composable.
- Passed `rawLibraryFiles` to `FolderSyncScreen` to ensure sync logic uses the base file list.

* Update info bar background and text colors in EpubReaderScreen to match the selected theme.

* Prevent accidental UI bar toggles immediately after scrolling in EPUB vertical mode.

* feat: implement EPUB highlights sync and legacy migration

- Implement Cloud and Local Folder sync for EPUB highlights.
- Add highlight JSON serialization/deserialization helpers in EpubReaderAnnotations.
- Implement automatic migration of highlights from SharedPreferences to the Database on book open.
- Add cleanup logic to remove legacy SharedPreferences data after successful DB migration.
- Update RecentFilesRepository to trigger local folder metadata sync when highlights are modified.
- Update FolderSyncWorker to pull highlights and custom names from linked folder metadata.

* Update intent filters

app/src/main/java/com/aryan/reader/LibraryScreen.kt

@@ -134,6 +134,7 @@ fun LibraryScreen(
     val isShelfContextualModeActive = selectedShelves.isNotEmpty()
     val sortOrder = uiState.sortOrder
     val shelves = uiState.shelves
+    val rawLibraryFiles = uiState.rawLibraryFiles
     val pagerState = rememberPagerState(
         initialPage = uiState.libraryScreenStartPage,
         pageCount = { 3 }
@@ -234,6 +235,7 @@ fun LibraryScreen(
     Box(modifier = Modifier.fillMaxSize()) {
         LibraryScreenContent(
             recentFiles = uiState.allRecentFiles,
+            rawLibraryFiles = rawLibraryFiles,
             shelves = shelves,
             selectedItems = selectedItems,
             selectedShelves = selectedShelves,
@@ -460,6 +462,7 @@ fun ShelfScreen(
 @Composable
 fun LibraryScreenContent(
     recentFiles: List<RecentFileItem>,
+    rawLibraryFiles: List<RecentFileItem>,
     shelves: List<Shelf>,
     selectedItems: Set<RecentFileItem>,
     selectedShelves: Set<String>,
@@ -759,7 +762,7 @@ fun LibraryScreenContent(
                 2 -> {
                     FolderSyncScreen(
                         syncedFolders = syncedFolders,
-                        allRecentFiles = recentFiles,
+                        allRecentFiles = rawLibraryFiles,
                         onAddFolderClick = onAddFolderClick,
                         onRemoveFolderClick = onRemoveFolderClick,
                         onEditFolderFiltersClick = onEditFolderFiltersClick,