Support drag & drop of attachments out of Notesnook

[alihamuh]

Is your feature request related to a problem? Please describe.

Currently, file handling on macOS is a one-way street when it comes to drag-and-drop. While users can easily drag files from Finder or a web browser directly into a Notesnook note, they cannot drag an attached file (e.g., a PDF, image, or document) back out of Notesnook to the Finder, Desktop, Mail, or any other native macOS application.

This creates friction in daily workflows where users need to quickly share or reorganize documents they have stored in their notes.

Describe the solution you'd like

We should implement standard macOS drag-and-drop support for note attachments.

• Users should be able to click and hold an attachment inside a note and drag it out of the Notesnook window.
• Dropping the file onto the Finder or Desktop should save a copy of the file to that directory.
• Dropping the file into another app (like Mail, Slack, or a browser window) should attach or upload the file as it would with any standard system file.