Karavan Space - Add option to override saved file

Would it be possible to have an

[x] replace existing file

in the karavan space (web designer) so when you save the file it does not save as

- example 1
- example 2
- ...

When you have a file already.

I would like to turn this [x] so I can run jbang in --dev mode and have karavan as a quick prototype UI designer.

Locate the Karavan Space web designer's save flow and its existing handling for duplicate filenames. Add the requested replace-existing-file option, then verify that enabling it overwrites the selected saved file while leaving the current example-1/example-2 behavior unchanged.

Written by the indexing model from the issue text.