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hypothetical design for a todo app

sits in the tray
click the tray icon to toggle the main window
has space for 10 (7? 12?) todo items
an item is a status icon and a short bit of text
status can be · or ✔ or ✘
click on an item to edit its text
click on a blank item to add a new item
click on the status to cycle through
marked items are removed at the end of the day
marked items are removed when the 'clear' button is pressed
items pack towards the top
hard maximum, the only way to make space is to mark items done