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/data/AppDatabase.kt

@@ -27,7 +27,7 @@ import androidx.room.TypeConverters
 import androidx.room.migration.Migration
 import androidx.sqlite.db.SupportSQLiteDatabase
 
-@Database(entities =[RecentFileEntity::class, CustomFontEntity::class], version = 14, exportSchema = false)
+@Database(entities =[RecentFileEntity::class, CustomFontEntity::class], version = 15, exportSchema = false)
 @TypeConverters(FileTypeConverter::class)
 abstract class AppDatabase : RoomDatabase() {
     abstract fun recentFileDao(): RecentFileDao
@@ -179,6 +179,12 @@ abstract class AppDatabase : RoomDatabase() {
             }
         }
 
+        val MIGRATION_14_15 = object : Migration(14, 15) {
+            override fun migrate(db: SupportSQLiteDatabase) {
+                db.execSQL("ALTER TABLE recent_files ADD COLUMN highlights TEXT DEFAULT NULL")
+            }
+        }
+
         fun getDatabase(context: Context): AppDatabase {
             return INSTANCE ?: synchronized(this) {
                 val instance = Room.databaseBuilder(
@@ -190,7 +196,7 @@ abstract class AppDatabase : RoomDatabase() {
                         MIGRATION_1_2, MIGRATION_2_3, MIGRATION_3_4, MIGRATION_4_5,
                         MIGRATION_5_6, MIGRATION_6_7, MIGRATION_7_8, MIGRATION_8_9,
                         MIGRATION_9_10, MIGRATION_10_11, MIGRATION_11_12,
-                        MIGRATION_12_13, MIGRATION_13_14
+                        MIGRATION_12_13, MIGRATION_13_14, MIGRATION_14_15
                     )
                     .fallbackToDestructiveMigration(false)
                     .build()