useAppRouter wraps every navigation in a View Transition. Opening a book is a
heavy render (the reader mounts and loads the book) that can overrun the
transition's ~4s DOM-update budget and abort with a TimeoutError (Sentry
READEST-9). Navigate to the reader with the plain router instead, matching
every other into-reader path in the app; the transition router stays for
lighter navigation. Applies to the tap-to-open flow (useOpenBook) and the
post-import queued open (library/page).
Fixes READEST-9
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Huang Xin
52be6fa066