minimal fltk vibe coding port

[piotrcurious]

AI generated vibe code . it compiles into very minimal version , 31k big after stripping. features are very limited :

• copy/paste/select all
• undo/redo (without undo/redo it compiles to 21k)
• open/save

perhaps adding linewrap would be useful. it was just AI test/experiment to verify if AI can code something in FLTK, but the result is very nice (it is smallest 'notepad' i know of , certainly useful on old computers) not sure if it should not be made into separate project but it was made by porting leafpad by AI thus i post it here.