BinadaH/zentle ? reverse-engineered prompt

Build me a fast minimalist note taking app like Zentle in Godot.

I want a clean canvas where I can quickly draw, add text, and move things around without a lot of menus getting in the way. The main tools should be pen, hand for panning, select for moving and resizing, and text for typing notes. Text should support simple formatting like bold, underline, and inline math expressions. Drawing should try to recognize simple shapes and let me adjust them after I draw them. I also want a theme picker so I can switch the look of the app from a config style setup, plus a grid and basic editor settings that save automatically.

Please include saving notes in a compact project file format and exporting selected regions to PDF or SVG. If possible, add a way to define reusable sketch shortcuts, so typing a trigger can insert a saved drawing. Keep it lightweight, responsive, and focused on speed. If you need to, look up current Godot docs online for the best way to do the export and file handling.