v4.0.0-beta.04

Added

• Auto-save to history on every editor output — Copy, Save, Pin, Upload, and Share from the editor now automatically persist the current image and annotations to screenshot history. A history entry is created on first output if none exists.
• Unsaved changes warning on editor close — closing the editor with unsaved changes shows a "Save & Close / Discard / Cancel" dialog. Warns for captures that were never saved (the image would be lost), and for history entries with annotation changes since last save.

Fixed

• Refined pencil stroke endpoint — strokes now end exactly where the user released the mouse instead of stopping short due to the smoothing algorithm pulling the endpoint inward.