Folder import\sync rework (#18)

* feat: rework Folder Sync architecture to separate Managed vs Linked books

- Introduced "Managed" (imported to app storage) vs "Linked" (SAF URI) book logic.
- Disabled Google Drive/Metadata synchronization for Folder-Linked books to respect privacy and storage.
- Updated deletion logic: Folder books are now marked as deleted in the DB to blacklist them from future auto-scans, while Managed books are permanently purged from local and cloud storage.
- Enhanced folder sync discoverability by adding a direct "Sync Folder" navigation button in Home screen.
- Implemented reactive pager navigation in MainScreen and LibraryScreen via LaunchedEffect to allow programmatic tab switching from the ViewModel.

* Implemented a local folder synchronization system to track and update book metadata across devices.

Key changes:
- Added `FolderBookMetadata` and `LocalSyncUtils` for serializing and managing metadata files in a `.episteme` directory.
- Implemented bidirectional sync in `FolderSyncWorker` to reconcile local database state with folder-based metadata using timestamps and Syncthing conflict resolution.
- Updated `MainViewModel` to trigger folder metadata sync when closing a book and verify for remote updates upon opening.
- Enhanced folder management with manual scan support via `WorkManager` and automatic cleanup of database entries when a folder is disconnected.
- Added `RecentFileDao` methods to support bulk deletion and prefix-based file lookups.

* Removed API 34 restriction for chapter processing and updated local folder sync directory name

* Increased TTS timeouts, added edge-to-edge support in MainScreen, and improved TtsChunk mapping safety

* Improved folder synchronization and metadata management.

- Added metadata-only sync option and triggered it on app start.
- Implemented hidden metadata filenames (prefixed with `.`) to reduce file clutter.
- Added automatic creation of `.nomedia` files in the sync directory.
- Enhanced sync conflict resolution by picking the latest metadata and cleaning up obsolete or orphaned files.
- Added "Sync Metadata" button to the Library screen.
- Updated UI labels for local folder sync to clarify Google Drive integration.
- Refactored `FolderSyncWorker` to support targeted metadata-only synchronization.

* Implement folder sync migration and refactoring

- Added a migration dialog to inform users about the folder sync refactor, where books are now read directly from external storage.
- Updated `MainViewModel` to handle migration state and trigger a full scan upon completion or dismissal of the dialog.
- Modified `FolderSyncWorker` to support legacy book matching during migration, updating file URIs and cleaning up internal app storage for migrated books.
- Improved synchronization logic between local and remote metadata, including cleanup of orphaned metadata files.
- Refined `RecentFileItem` updates during sync to preserve progress and bookmarks based on last modified timestamps.

* Implemented pull-to-refresh for library sync and enhanced folder file deletion.

- Added `isRefreshing` state to `MainViewModel` and integrated `PullToRefreshBox` in `HomeScreen`.
- Implemented `refreshLibrary` to trigger cloud and folder metadata synchronization.
- Updated deletion logic to physically remove files and metadata from synced local folders.
- Added a warning to the delete confirmation dialog when removing folder-synced items.
- Improved folder sync reliability by performing lazy cleanup of missing files during interaction and sync.
- Fixed a bug where sync loading indicators would not retract on failure or cancellation.

* Improved bookmark navigation and scroll synchronization in EPUB reader

- Refined bookmark navigation logic for vertical scroll mode to handle chunk injection more reliably.
- Added `isNavigatingToBookmark` state to show a loading overlay during long jumps.
- Implemented `onScrollFinished` callback in `CfiJsBridge` to synchronize UI state with WebView scroll completion.
- Updated `ChapterWebView` to use `rememberUpdatedState` for JavaScript bridge callbacks to ensure data consistency.
- Improved `getCurrentCfi` and `scrollToCfi` in `epub_reader.js` with better visibility probing and retry logic for detached nodes.

* Implemented background metadata extraction for folder sync.

Key changes:
- Added `MetadataExtractionWorker` to handle heavy metadata and cover extraction for files in the background.
- Refactored `FolderSyncWorker` to perform fast file discovery using placeholders, enqueuing the metadata worker upon completion.
- Added `getFolderBooksWithoutCovers` query to `RecentFileDao`.
- Updated UI components (`EmptyState`, `MainViewModel`) to improve user feedback during sync and provide clear setup actions.
- Enhanced `EmptyState` composable to support secondary actions and custom button text.

* Updated Library Screen UI

app/src/main/java/com/aryan/reader/data/RecentFileDao.kt

@@ -17,6 +17,7 @@
  *
  * mail: epistemereader@gmail.com
  */
+// RecentFileDao.kt
 package com.aryan.reader.data
 
 import androidx.room.Dao
@@ -33,6 +34,9 @@ interface RecentFileDao {
     @Query("SELECT * FROM recent_files WHERE isDeleted = 0 ORDER BY timestamp DESC")
     fun getRecentFiles(): Flow<List<RecentFileEntity>>
 
+    @Query("SELECT * FROM recent_files WHERE sourceFolderUri = :sourceFolderUri AND isDeleted = 0")
+    suspend fun getFilesBySourceFolder(sourceFolderUri: String): List<RecentFileEntity>
+
     @Query("SELECT * FROM recent_files")
     suspend fun getAllFiles(): List<RecentFileEntity>
 
@@ -57,6 +61,12 @@ interface RecentFileDao {
     @Query("SELECT * FROM recent_files WHERE uriString = :uriString")
     suspend fun getFileByUri(uriString: String): RecentFileEntity?
 
+    @Query("DELETE FROM recent_files WHERE sourceFolderUri = :sourceFolderUri")
+    suspend fun deleteFilesBySourceFolder(sourceFolderUri: String)
+
+    @Query("SELECT * FROM recent_files WHERE bookId LIKE :prefix || '%'")
+    suspend fun getFilesWithIdPrefix(prefix: String): List<RecentFileEntity>
+
     @Query("DELETE FROM recent_files")
     suspend fun clearAll()
 
@@ -74,4 +84,7 @@ interface RecentFileDao {
 
     @Query("UPDATE recent_files SET isRecent = 0, lastModifiedTimestamp = :timestamp WHERE bookId IN (:bookIds)")
     suspend fun markAsNotRecent(bookIds: List<String>, timestamp: Long)
+
+    @Query("SELECT * FROM recent_files WHERE sourceFolderUri IS NOT NULL AND coverImagePath IS NULL AND isDeleted = 0")
+    suspend fun getFolderBooksWithoutCovers(): List<RecentFileEntity>
 }