Build 279: send books to your CrossPoint, and a bug button in the reader

[briarrrn]

Build 279 is on TestFlight now.

The headline is for anyone with an XTEINK X4 or X3 flashed with CrossPoint firmware: Apogee can now send books to the device and keep reading progress in step, both ways. Put the phone and the device on the same Wi-Fi and open More. The CrossPoint row finds the device and opens into its files. Send Books picks from your library: the app downloads what it needs, uploads with a sleep-screen cover, and seeds your reading position so the book opens where you left off. Progress you make on the device pulls back to your server, and Quick Add can keep the device topped up by itself. There's a CrossPoint page on the wiki with the full flow.

Also new:

• A round bug button in the reader menu (TestFlight builds only). It shows a report with the book and your reading position already filled in, ready to screenshot or file.
• Progress saving is steadier and more honest. The reader says "Not synced yet" until a sync really happens, a failed save retries once by itself, and "Newer progress on server" is information rather than an alarm.
• The finished-book sheet waits for the actual end when a book's last chapter is an epilogue, instead of appearing as the epilogue starts.
• Reading opens the format you downloaded, and asks when you have both. The medium widget no longer clips the title next to a portrait book cover. CarPlay no longer crashes when taps land during a screen transition. Books in French and German now get Up Next at the right chapter. Servers with open registration offer sign-up from the app, and an account with no library access is told so instead of seeing an empty library. The Library picker is easier to tap.

Fixes reported here: #86