MA-TUI 0.9.2

• Add a screenshot to the README.
• Trim the README's install steps to read the same across releases instead of
  hardcoding a version.
• Drop the stale "(Flatpak Beta)"/"(beta)" wording from the Flatpak desktop
  entry and the Arch package description; 0.9.1 was already the first
  release that was not a beta.
• Draw a rule between the player list and the queue instead of leaving blank
  space, matching every other section boundary in the layout.
• Show the actual reason a local audio stream failed instead of always the
  same generic message. No logger was added: sendspin's own protocol
  logging can embed raw server payload text as low as debug/trace level,
  which this module's existing sanitize-only policy exists to avoid.