File upload to tiptap editor

[yujonglee]

Different from #849. Not audio upload, but attaching file to the current note. Eventually we can do OCR or feed image directly as input tokens to the model.

https://tiptap.dev/docs/editor/extensions/functionality/filehandler

https://www.codemzy.com/blog/tiptap-drag-drop-image

ueberdosis/tiptap#1600

[yujonglee]

https://tiptap.dev/docs/editor/extensions/functionality/filehandler
https://tiptap.dev/docs/editor/extensions/functionality/drag-handle

These two recently open-sourced by Tiptap too.

[yujonglee]

Inspiration:

[yujonglee]

Note that for file-selector, Tauri already have one: https://v2.tauri.app/plugin/dialog/#open-a-file-selector-dialog