improvement: use svelte custom element option

refactor: pass only the part of dir data that components need

dev: add prettier and format

dev: move to typescript

refactor: move components into new `components` folder

refactor; move `syncfs` to `lib.js`

fix: handle invalid initialDir value

fix: only drop files in folder content area

refactor: move folder content into a component

style: improve empty folder info style

feature: delete files

refactor: move part of the state to `state.svelte.js`

show entry actions in a dialog

dev: add dark mode meta tag in the html testing files

change license to LGPL-3.0-or-later (#2)