* Added `TooltipIconButton` and integrated tooltips for tool icons in app bars
* Added external translate and search support for EPUB and PDF readers
* docs: refine project overview and update build instructions in readme
* perf(pdf): native Pdfium-based reflow engine with auto-open
Migrate PDF-to-Markdown reflow generation from PDFBox to a custom
native implementation using Pdfium. This transition improves
processing speed by ~10x and significantly reduces memory overhead.
- Native JNI Bridge: Implemented `pdfium_bridge.cpp` using `dlopen`
to hook into the existing `libpdfium.so` memory space.
- Optimized Extraction: Replaced character-by-character JNI calls
with bulk array retrieval (`getPageFontSizes`, `getPageFontWeights`),
drastically reducing JNI boundary overhead.
- Enhanced Accuracy: Improved Markdown formatting logic by using
native font weight (bold) and relative font size variance (headers).
- Thread Safety: Refactored generator to process pages sequentially
while synchronized with the global `PdfiumCore.lock` to ensure
stability across concurrent UI operations.
- Seamless UX: Implemented a reactive auto-open system in the
PDF viewer that tracks user intent and navigates to the reflow
view immediately upon background task completion.
* Improved PDF to Markdown conversion and added cache cleanup.
- Implemented automated cleanup of imported file caches when deleting books.
- Enhanced `PdfToMarkdownGenerator` with support for font flags (italics), improved kerning, and smarter paragraph wrapping.
- Updated `NativePdfiumBridge` and C++ JNI code to extract font information flags from PDFium.
* Implemented seamless file switching and enhanced reflow transition logic.
Key changes include:
- Added `switchToFileSeamlessly` to `MainViewModel` to handle state transitions and navigation when switching between PDF and reflowed text views.
- Updated `generateAndImportReflowFile` to support automatic opening of the generated file at a specific page/chapter.
- Integrated `NavigationEvent` and `CompletableDeferred` to manage asynchronous navigation and state updates during file switches.
- Modified `EpubReaderScreen` and `PdfViewerScreen` to pass the current position when toggling between PDF and text modes.
- Updated `AppNavigation` to move navigation logic out of the `NavHost` and added loading overlays to viewers to improve UI feedback during transitions.
* Added support for external dictionary apps and a dictionary settings sheet.
* Refactored external dictionary integration and improved package visibility
- Updated `AndroidManifest.xml` with `<queries>` for common dictionary apps and intent actions (`PROCESS_TEXT`, `SEARCH`, `SEND`) to support Android 11+ package visibility.
- Refactored `ExternalDictionaryHelper` to streamline dictionary discovery using `Intent.ACTION_PROCESS_TEXT` and `colordict.intent.action.SEARCH`.
- Added a package blocklist in `ExternalDictionaryHelper` to filter out system services (e.g., Samsung Pass, GMS) from dictionary lists.
- Simplified `launchDictionary` logic to prioritize `PROCESS_TEXT` intents.
- Fixed a bug in `PdfViewerScreen` to only show the dictionary upsell dialog when `useOnlineDictionary` is enabled.
* Refactored dictionary settings into a dialog and updated dictionary selection logic.
- Renamed `DictionarySettingsSheet` to `DictionarySettingsDialog` and converted it from a bottom sheet to a formal dialog.
- Redesigned the dictionary settings UI with a clearer distinction between AI and external app modes.
- Added a "Search" option to the external dictionary list that triggers a web search.
- Updated `ExternalDictionaryHelper` to include a package blocklist and support for generic web search intents.
- Simplified `PdfHelper` by removing Pro user checks for the "Dictionary" action.
- Updated icons for dictionary settings across the EPUB and PDF readers.
