v0.91.0: Open site

Open site: sign in on an extension's site, the way Mihon's Open in WebView does. BatCave now shows Sign in to keep
reading to anyone not signed in, so in Uchiyomi it listed nothing
(#314, reported by langwire); in Mihon you sign in once in its
WebView. Uchiyomi had no such page until now.

Open site

• In Admin → Sources, an extension's sheet has Open site: the site in the extension engine's own browser, live
  and over the whole screen. Click, scroll and type as on the site: on a phone a tap is a click, a swipe scrolls, and
  Keyboard brings up the keyboard. Sign in, or pass the site's check, and press Done: the engine keeps the
  sign-in for that extension, and the sheet says whether the source answers now. Start over opens the home page
  again.
• Kept working by itself. A source you have done this for gets a quiet visit of its home page whenever it fails, at
  most once in half an hour, and the call is tried again. BatCave's check lasts a day, so this keeps it going. An
  extension that answers "Open in WebView…" gets the same visit.
• Admins only, one site at a time, closed after ten minutes without input. It runs over ordinary HTTP, so a reverse proxy
  needs no websocket setting for it. It needs the bundled extension engine, or your own Suwayomi from v2.4 on.

Upgrading

• Nothing to do.

Uchiyomi Desktop (beta): downloads

Uchiyomi as a program on your own computer, for Windows and Mac. On first launch it asks how you want to
use it: on this computer (the whole app, with the library in a folder on your PC and no Docker or
server to run) or connected to your own Uchiyomi server (a window onto the server you already run).

Your computer	Download
Windows (x64)	Uchiyomi-Setup-0.91.0.exe
Mac with Apple silicon (M1 or newer)	Uchiyomi-0.91.0-arm64.dmg
Mac with an Intel processor	Uchiyomi-0.91.0-x64.dmg

Only those three are for you: the .zip, .blockmap and latest*.yml files are what the app's own updater
reads. The same installers are also here under names without a version (Uchiyomi-Setup.exe,
Uchiyomi-mac-arm64.dmg, Uchiyomi-mac-x64.dmg), which always lead to the newest release.

The app is not signed yet, so the first launch takes one extra step:

• Windows: "Windows protected your PC" appears once. Choose More info, then Run anyway. A PC
  with Smart App Control turned on blocks unsigned apps with no way past it; use the Docker install there.
• macOS: open the dmg and drag Uchiyomi to Applications. The first time you open it, macOS refuses;
  go to System Settings → Privacy & Security and choose Open Anyway.

Windows installs updates by itself. A Mac cannot update an unsigned app, so there a new version is a new
download; the menu-bar icon and Admin → Health say when one is out.

Step by step, with pictures -- which file, the first launch on each system, the two ways to use it, adding
sources, updates, backups, where files live and uninstalling:
the desktop guide.