Replace privacy popup with PrivacyModal and reorganize auth UI components
Remove signed-out persistence and centralize session handling in useAuthSession
Move document viewers and Kokoro voice helpers into dedicated modules
- Introduce a toggleable grid/list view for the document list, enhancing organization and display flexibility. This involved updates across `DocumentList`, `DocumentFolder`, `DocumentListItem`, and `SortControls`.
- Add a new `CodeBlock` component and integrate detailed Docker-based self-hosting instructions into the footer.
- Enhance privacy policy popover with clearer details on Deepinfra usage and strongly recommend self-hosting for secure experience.
- Implement conditional rendering and feature gating based on the `isDev` environment variable, differentiating features between the production demo and self-hosted instances. Affected components include `page.tsx`, `DocumentSettings.tsx`, `SettingsModal.tsx`, and `config.ts`.
- Clarify that advanced features like audiobook export and word-by-word highlighting via `whisper.cpp` are exclusive to self-hosted setups and are disabled in the demo.
- Expand the list of supported document types on the homepage to include MD and TXT.
- Integrate new `ListIcon`, `GridIcon`, and `CopyIcon` to support UI enhancements.
- Add a custom `xs` breakpoint in `tailwind.config.ts` for improved responsive design.
- Implement custom previous/next page buttons for EPUB viewer.
- Display current page number out of total pages.
- Introduce an in-viewer, toggleable table of contents (TOC) for quick chapter navigation.
- Hide default `react-reader` navigation arrows and title bar to prevent redundancy.
- Adjust `react-reader` styles to optimize content area and ensure custom controls are visible.
- Update description for EPUB theme setting in document settings.
- Add `ChevronLeftIcon` and `ChevronRightIcon` to icon library.
- Update Playwright tests to reflect new navigation button labels.
- Introduce `/api/whisper` endpoint which uses `whisper.cpp` (via a `WHISPER_CPP_BIN` executable) and `ffmpeg` to generate word-level audio alignments from provided audio and text.
- Integrate word-level alignments into `TTSContext`, tracking the currently spoken word based on audio seek position and provided timestamps. Alignments are cached in-memory and fetched asynchronously.
- Add new configuration options (`pdfWordHighlightEnabled`, `epubWordHighlightEnabled`) to `ConfigContext` and `Dexie` for enabling/disabling the feature.
- Implement visual word highlighting in both `PDFViewer` and `EPUBViewer` by mapping TTS-aligned words to rendered text elements.
- Enhance `EPUBContext` and `PDFContext` with new `highlightWordIndex` and `clearWordHighlights` functions, utilizing fuzzy string matching (`cmpstr`) to robustly align spoken words with displayed text for accurate highlighting.
- Update `DocumentSettings` to include user-facing toggles for the new highlighting modes.
