feat: stdin

[notnmeyer]

append to daylog via stdin,

➜ echo "- ate a second burrito" | dist/daylog; dist/daylog show

   2026/02/18

  • ate a burrito
  • ate a second burrito

works with the relative times,

➜ echo "- TODO: eat a burrito" | dist/daylog -- tomorrow; dist/daylog show -- tomorrow

   2026/02/19

  • TODO: eat a burrito