test(notifications): add unit tests for reply/markAsRead/reaction receivers

Adds Robolectric-based androidHostTest coverage for the three notification
BroadcastReceivers. Verifies:

- ReplyReceiver sends a DataPacket derived from the contactKey then calls
  appendOutgoingMessage followed by markConversationRead in that order.
- MarkAsReadReceiver invokes markConversationRead, ignores wrong actions,
  and drops intents missing the contact key.
- ReactionReceiver dispatches a ServiceAction.Reaction and, on success,
  calls markConversationRead. Failures in dispatch short-circuit markRead.

Uses the existing FakeRadioController and FakeMeshServiceNotifications
(marked open so tests can record calls) plus mokkery for ServiceRepository,
mirroring the pattern in SendMessageWorkerTest. Fakes are wired through a
per-test Koin graph to match each receiver's KoinComponent injection.

Also fixes a pre-existing compile break in MeshServiceNotificationsImplTest
that was missing the shortcutManager constructor argument.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

core/testing/src/commonMain/kotlin/org/meshtastic/core/testing/FakeMeshServiceNotifications.kt

@@ -24,7 +24,7 @@ import org.meshtastic.proto.Telemetry
 
 /** A test double for [MeshServiceNotifications] that provides a no-op implementation. */
 @Suppress("TooManyFunctions", "EmptyFunctionBlock")
-class FakeMeshServiceNotifications : MeshServiceNotifications {
+open class FakeMeshServiceNotifications : MeshServiceNotifications {
     override fun clearNotifications() {}
 
     override fun initChannels() {}

core/testing/src/commonMain/kotlin/org/meshtastic/core/testing/FakeRadioController.kt

@@ -31,7 +31,7 @@ import org.meshtastic.proto.User
  * A test double for [RadioController] that provides a no-op implementation and tracks calls for assertions in tests.
  */
 @Suppress("TooManyFunctions", "EmptyFunctionBlock")
-class FakeRadioController :
+open class FakeRadioController :
     BaseFake(),
     RadioController {