Android half of ios#34. A story disappears from its author's own device
too, so there was no way to keep something you made.
🔴 Only ever your own, and the rule is `Vault.isSaveable` rather than a
condition on the menu item. Saving somebody else's story keeps a copy of
something they were told would disappear — the opposite of what the
feature promises them — and a guard living in a composable is one
refactor away from being lost. Tested from both directions.
⚠️ Written through MediaStore, so no storage permission is asked for. An
app inserting its own entry needs no runtime grant on any version this
app supports; asking for WRITE_EXTERNAL_STORAGE in order to save one
picture would request read access to everything the person has, to
perform a write.
⚠️ The message says the copy has left the disappearing model and names
where it went. "Saved" alone would be true and useless — somebody not
told that may reasonably assume the expiry still covers it.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
