`ConverterScreen` and `JoinScreen` each inlined their whole `when (state)`
inside the public entry point, and state arrived only as `viewModel.state`.
That left four of the twelve state branches across the two screens with no
test that could ever reach them: driving a real ViewModel needs a WorkManager
and a media probe in the constructor, and even then `Waiting` follows a denied
foreground start and `Converted`/`Joined` follow a worker run that has already
succeeded.
So the `when` moves into `ConverterScreenContent` and `JoinScreenContent`,
which take the state, the settings, the validation and an actions holder. The
entry points keep the three launchers and `collectAsStateWithLifecycle` and
nothing else.
The callbacks travel in `ConverterActions` / `JoinActions` rather than as loose
parameters because detekt's `LongParameterList` sits at its default threshold
of six and `config/detekt/detekt.yml` does not relax it for `@Composable` --
`AdvancedPicker` already sits exactly on it. Twelve flat parameters would turn
a clean detekt run red; data classes are exempt from the rule.
Nothing else changed. The body was cut and pasted rather than retyped, so the
U+2026, U+2014 and U+00B7 characters the leaf tests match on are the same
bytes, and `is Idle -> Unit` in the nested `when` -- permanently unreachable,
and deliberately kept -- survives the move. The diff stops above `FormatPicker`
in one file and above `FileRow` in the other, which is why the leaf suites
#57-#60 landed pass unedited: every one of them composes a leaf directly and
none references either entry point.
The two new tests are the bite, one per screen and one per direction of the
seam: a `Converted` / `Joined` state renders Save, and tapping Save hands back
the name the finished job chose. The state matrix itself is #62 and #63.
JMR-dev
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