Merge lines.love

Dependencies

• [2] LXW73CJ3 Merge lines.love
• [3] BH7BT36L ctrl+a: select entire buffer
• [4] KKMFQDR4 editing source code from within the app
• [5] D4FEFHQC flesh out Readme
• [6] 27DROQW2 Merge upstream into main
• [7] UEE5W7WJ document one more shortcut
• [8] BPL2TDWH document one more shortcut
• [*] FS2ITYYH record a known issue

Change contents

• edit in README.md at line 54
  [4.93]→[2.83:83](∅→∅)
  −
• resurrect zombie in README.md at line 54
  [4.91]→[3.665:739](∅→∅),[4.91]→[3.665:739](∅→∅)
  + * mouse drag or `shift` + movement to select text, `ctrl+a` to select all
• resolve order conflict in README.md at line 54
  [4.93]

  [3.665]