Port the instrumented ComposeScreenTest to a Robolectric JVM Compose
test (batch 7/9 of umbrella #373) so ComposeScreen's render + interaction
code counts toward JaCoCo's JVM-testable surface, and drop
`**/ComposeScreen*` from `jacocoNonJvmTestableSurface`.
ComposeViewModel is large (7 collaborators, several Context/Room-backed),
so it is mocked — mirroring AccountPickerScreenJvmTest / ManualSetup
ScreenJvmTest — with its state/accounts/finished flows stubbed so every
render/state branch is injectable. A RESUMED lifecycle owner (also the
back-press dispatcher owner) and a no-op ActivityResultRegistryOwner let
`collectAsStateWithLifecycle`, the BackHandler, and the attachment/inline
-image launchers compose on the JVM. The embedded RichTextBodyField renders
live; its toolbar accessibility labels and body-change plumbing are covered.
The instrumented ComposeScreenTest stays as the on-device E2E. JaCoCo floor
unchanged (0.79); overall line coverage 0.86.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
JMR-devandClaude Opus 4.8
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