Add book information dialogs and compact toolbar actions with source provenance. Reuse Streamable HTTP for alternative discovery and preserve cached text when a forced refresh fails.
Route login, shelf, library, file operations, reading, sources and extension feedback through one compact themed notification host. Keep native modal feedback in the top layer, escape remote text, update progress in place and let reading controls receive clicks beneath message text. Cover lifecycle, error handling and layout with unit and Chromium checks.
hectorqin