- Reorganized utility modules from `src/utils` to `src/lib` for clearer separation of concerns.
- Introduced new, dedicated type definitions in `src/types` for improved type safety in configuration and TTS API interactions.
- Replaced `src/types/appConfig.ts` with `src/types/config.ts`.
- Added `src/types/tts.ts` for TTS request payloads, error structures, and retry options.
- Updated module imports across several contexts (`Config`, `EPUB`, `HTML`, `PDF`, `TTS`) and components to reflect the new `lib` and `types` locations.
- Enhanced TTS API request and error handling in `src/app/api/tts/route.ts` and TTS-consuming contexts with explicit types.
- Simplified `ProgressCard`, `ProgressPopup`, and `AudiobookExportModal` components by removing the `isProcessing` prop, centralizing processing state management.
- Streamlined `HTMLContext` by removing `createFullAudioBook` and `isAudioCombining` properties, focusing its scope.
Migrates scattered configuration items and last document locations
from the legacy `config` table to new, dedicated Dexie stores.
- Introduces a singleton `app-config` table (`AppConfigRow`) to standardize
and structure all application settings in a single object.
- Creates a `last-locations` table for efficient storage of document read positions.
- Updates `ConfigContext` to utilize `dexie-react-hooks`' `useLiveQuery`
for reactive and simplified state management.
- Implements a database upgrade path (from DB_VERSION 4 to 5) to migrate
all existing user settings seamlessly.
- Simplifies config access and updates with new `getAppConfig` and `updateAppConfig`
utility functions.
- Removes the deprecated `config` table after successful migration.
- Updates consumers like `SettingsModal` and test helpers to align with
the new config structure.
