v0.89.0: Badges unlock avatar frames

Badges unlock frames for your avatar, you can merge or split double pages yourself, and a series can follow up to ten
sources. The frames are part three of CheetahDoesStuff's badges idea
(#267), merging and splitting by hand began as @Squeaks72's pull
request (#262), rebuilt on v0.77.0's joining, and more sources per
series is TIGamingTV's request (#305). Thank you all three.

Badges unlock avatar frames

• Each badge unlocks a frame, cast in the badge's own metal: Bronze for Reader, Silver for Bookworm, Ember for
  On a roll (a flame for each day of the streak), Gold for Centurion (with a laurel), Moonlight for Devoted (a
  crescent and stars) and Aurora for Legend (a crown and a slow halo).
• Pick one in Profile → Settings → Appearance → Avatar → Frame, or from Badges unlock frames for your avatar
  under the badges. A frame you have not earned yet is greyed: tap it to see what it takes. None takes yours off.
• Everyone sees it. The frame goes wherever your avatar shows: the corner, the household board, comments and shared
  lists. The server checks it is yours to wear, with the same rules the badges use.
• It moves a little. A sheen passes over the metal now and then, the embers flicker and Legend's ring turns.
  Reduce effects or your system's reduced motion keeps them still. Small avatars, in comments for example, show the
  ring alone.

Merge and split double pages yourself

• When the joining gets it wrong. Join split double pages can join two pages that are not one picture, or miss two
  that are. Reading page by page, This page in the reader's settings (and the right-click menu) now offers what fits
  the page you are on:
  • Merge with the page on the left or on the right. Left and right are your screen's, so on a right-to-left
    read the next page is the one on the left.
  • Show as two pages for a pair the server joined, and Join these two pages again to give it back.
  • Undo the merge for a pair you joined.
  • In Double spread, two pages side by side: Merge these two pages.
• Yours alone. It is saved on your account, so it follows you to your other devices and into chapters you download,
  and nobody else's reader changes. A merge you made shows even with Join split double pages off.
• A page is in one spread only, and wide pages and the ends of a chapter offer nothing. If a chapter's file is replaced
  by one with another page count, it starts afresh.

More sources per series

• Other sources per series, in Admin → Settings → Downloads → More options: how many sources besides its main
  one a series may follow, from 1 to 10. It is 3 by default, as before. It counts the sources you add and the ones
  Uchiyomi finds on its own alike.
• Each extra source is one more chapter list to ask for at every library update, which the menu says. Lowering the number
  unfollows nothing: a series that follows more keeps its sources, and follows no new one.
• It replaces the server setting MAX_FOLLOWED_SOURCES, which is now only the starting value until the menu is used.
• The add dialog no longer says already following two when a series has as many sources as it may.

Upgrading

• Nothing to do. If your server sets MAX_FOLLOWED_SOURCES, the menu shows that number until you pick another.

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-0.89.0.exe
Mac with Apple silicon (M1 or newer)	Uchiyomi-0.89.0-arm64.dmg
Mac with an Intel processor	Uchiyomi-0.89.0-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.