[Flameshot] Allow Edit in a dedicated window

### Feature Description I lost so many edits so many times because so many things can happen in edit mode. You can press ESC accidentally, you can start another screenshot selection during the edit. <img width="914" height="631" alt="Image" src="https://github.com/user-attachments/assets/ccdcef04-361b-4ede-af6d-99ef790bc4d0" /> Any chance you could do it like GreenShot for Windows, where after screen selection you can either copy to clipboard or open in the editor for GreenShot. A dedicated edit window would prevent the loss of changes unless explicitly closed. Could have potentially multiple pending edits. I know in current model I could open a selection in some editor, but those editors usually don't have quick arrows, squares, text, color selection like in FlameShot/GreenShot, so I love the simplicity of FlameShot editor, but I don't like how fragile it is to lose the changes. Also a dedicated popup window to edit would allow let say minimize the window, take another screensho