Bulk-convert the type of flashcard

✨ What new feature or change would you like to see added in RemNote?

I would propose the ability to bulk-convert the type of flashcard.

This feature would allow a user to select multiple Rems at once (e.g., in a document or through a search query) and change their fundamental type with a single command. For example, a user could select 50 "Basic (Single-Line)" flashcards (Front >> Back) and instantly convert them all into "Multi-Line" flashcards (Front >>> Back Item 1, Back Item 2, ...).

This conversion could apply to various Rem types:

• From Basic (>>) to Multi-Line (>>>)

• From Concept (::) to Descriptor (;;)

• From a flashcard of any type to a plain Rem (removing the flashcard property entirely) and vice-versa.

🤔 What problem does it solve for you? How would it improve your workflow or experience with RemNote?

The core problem it solves is the tedious manual labor required to evolve simple facts into nuanced knowledge. When I use an AI to generate a first pass of flashcards from my notes on a Python topic, it often produces dozens of simple, single-line cards. This is a great start, but it's rarely the optimal format for deep, lasting comprehension.

The current workflow to fix this is painfully slow. I have to go through each card, one by one, and manually change its type. This creates a significant bottleneck and discourages me from making the very improvements that would deepen my learning.