Freehand / Ink Annotation Support for PDF Reader (Stylus & Tablet)

[lemintare]

The current PDF reader supports text-based annotations (highlights, notes, bookmarks), but there's no way to draw freehand on a page. When using BookLore on a tablet with a stylus (e.g. iPad + Apple Pencil, Android tablet + Wacom/USI stylus), this makes it impossible to hand-write notes or mark up diagrams directly in the reader.

An ink/freehand drawing layer on top of the PDF page, similar to what tools like Xodo or PDF Expert offer. Ideally:

• Pressure sensitivity support via the Pointer Events API
• Ability to choose pen color and thickness
• Eraser tool
• Annotations saved as standard PDF ink annotations (so they're portable and visible in other PDF readers)

Is it possible?