With a file open in the desktop app, figcraft-cli could change it on disk;
the next Save (or auto-save) wrote the app's copy over it and said
"Saved", losing the CLI's changes.
Each tab now remembers its file's size and modification time when it
opens, reverts or saves it (the Stamp library files already use), and
Save and auto-save refuse while the file on disk differs, pointing to
Revert to saved or Save as. Scripts pass `file.save {overwrite: true}`.
Save as and saves to an explicit path are unchanged.
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