MediaRiffle v0.5.1

✨ Features and improvements

• Switch user: everyone signed in on a device (with "Keep me signed in") is listed under your name → Switch user
  and on the sign-in page, to switch between without a password, like Google accounts or Netflix profiles. Add another
  account from there; sign out one or all. An account can ask for a PIN before others switch into it (Profile → Switch
  user PIN). Admin still asks for its own two-step check after a switch. See docs/configuration.md.
• Two-step verification for Admin: Admin asks for a passkey (Face ID, Touch ID, Windows Hello, a phone or a
  security key) or an authenticator app's code (Apple Passwords, Google or Microsoft Authenticator, 1Password, …), once
  every 12 hours. An admin without one is walked through setting it up the first time they open Admin, ending with ten
  one-time recovery codes. Manage passkeys, the authenticator and recovery codes under Profile; another admin can reset
  someone's under Admin → Users. Signing in itself is unchanged. See docs/configuration.md.
• 4K transcodes: a 2160p level (H.264 at about 25 Mbit/s) for Auto and the quality menu, when the server allows it
  (Transcoding:MaxHeight 2160, MaxVideoKbps about 30000; best with a hardware encoder). For browsers that can't
  play a 4K file's HEVC as it is, and 4K Chromecasts. The quality menu now lists only the levels a file can have.
• HDR tone mapping: HDR video (HDR10, HLG) converted to H.264 is tone-mapped to ordinary colours instead of
  looking washed out. Needs ffmpeg's zscale filter, which most builds have (the log says if not);
  Transcoding:ToneMapHdr turns it off. See docs/configuration.md.

🐞 Bug fixes

• 4K transcodes and HDR tone mapping (!8) (@acalcutt)
• Switch user: accounts signed in on a device, with an optional PIN (!7) (@acalcutt)
• Admin two-step verification (passkeys / authenticator app), and shows with several series (!5) (@acalcutt)
• A show's other series are told apart: season folders named for another series of the show (UK - Season 01,
  All Stars - Season 02, Down Under - S01, Global All Stars Season 01) used to be merged into the show's own
  seasons by the episode numbers in the file names. Each is its own series now, and files loose in the show's folder
  named for another series (drag.race.espana.s01e01.mkv) are too. A show with several picks the series first, then
  its seasons; Play all and the next episode go series by series, the show's own first. Episodes already in the
  library are filed again at the next scan, without reading the files again.
• Episode thumbnails stay in their place: a frame was shown at its full size and covered the episode's title.