The importer skipped a slide whose part was missing or unreadable and only
logged it, so `info` showed one slide fewer with exit code 0 and a save wrote
the shorter deck over the original.
`deckcraft_pptx::import_checked` returns the parts it left out (`import` is
unchanged). The engine carries them as `Damage::slides` next to the damaged
media of a `.deckcraft` file: `file.open` and `file.openBytes` return
`lostSlides`, the app shows a message and opens a repaired copy (so Save asks
for a new name), and `deckcraft-cli` warns on stderr.
Co-Authored-By: Claude Code <noreply@anthropic.com>
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