The App Extension adds the stylesheet for you.

If you install the UI package directly, import the stylesheet in your boot file or app entry:

import '@quasar/quasar-ui-qflashcard/dist/index.css'

Quasar CLI projects can also centralize the stylesheet in quasar.config.ts:

// Note: using ~ tells Quasar the file resides in node_modules
css: [
  "app.scss",
  "~@quasar/quasar-ui-qflashcard/dist/index.css",
],

Yes. After the App Extension is installed, run:

quasar describe QFlashcard
quasar describe QFlashcardSection

The same generated API is shown on the Using QFlashcard page.

Yes. Use no-hover on QFlashcard, then control each QFlashcardSection with its active prop.

Yes. transition accepts a string or an array. A string with spaces, such as fade-in flip-left-in, is split into multiple transition classes.