Quarters 0.8.1

Fixes for agents that run full-screen (recent Claude Code versions), and
the server in Docker:

• The conversation stays after a reload or an idle tab (#14, #15).
  Recent Claude Code versions draw full-screen, on the terminal's alternate
  screen, and scroll their own history with the mouse wheel. They switch
  that on once, as they start; a browser that joined later, reloaded, or
  reconnected after sitting idle replayed only the recent output, so it
  lost the full-screen mode and mouse reporting: the conversation was blank
  and scrolling did nothing. Quarters now remembers the modes a program
  has switched on and replays them first, and taking a tab over or
  resizing it clears the screen without dropping them. On phones, swiping
  a full-screen agent scrolls its history.
• Windows no longer take sessions from each other by themselves (#16).
  The mouse moving over a terminal and a window gaining focus are reported
  to full-screen agents; Quarters treated those reports like typing, so
  two windows showing the same session (the Mac and a browser) could take
  it back and forth, each time redrawing it at another size. Only typing,
  clicking and tapping take a session over now; reports from a window that
  isn't the one in use are dropped. Taking a tab over makes the agent
  redraw every time (the size nudge was too quick for Claude Code to see).
• The ACTIVE list shows from 5 projects (#17). With fewer, every
  project fits at a glance, and a project listed both in ACTIVE and in its
  group looked like two projects.
• Checkpoints work in a new repository (#18): where nothing had ever
  been staged, every checkpoint failed with "index file smaller than
  expected".
• Two timing bugs CI found (#19): a file staged and then changed to the
  same size within a second could be checkpointed as staged, and
  config.json saved in the editor could stay unused on Linux until the next
  change.
• Run the server in Docker (#20): docker/ has a Dockerfile and a
  compose.yaml (the server, Claude Code, a volume for settings and
  sign-ins, your code folder); see the README's Docker section.