Serving files

[willmcgugan]

We need a method to expose a file from a Textual app which save it locally, or downloads it when running as a web application.

Locally the file would be copied to a pre-determined directory. Probably ~/Downloads or whatever makes sense on the OS.

As a web application, the browser would treat it as a download.

The API would be something like this (on App):

def save_file(self, path_or_filelilke, mime_type:str, download:bool) -> None:
    ...

TBD

• Should we separate opening a file from downloading?
• How do we configure where the file saves locally?

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