feat(core): add event revisions and saved-device local labels

Platform contract harnesses need monotonic event revisions for at-least-once
dedup and a typed rename API that survives listing.

Co-authored-by: Cursor <cursoragent@cursor.com>

shared/src/commonMain/kotlin/com/vnidrop/app/core/CoreModels.kt

@@ -13,6 +13,7 @@ data class CoreStatus(
 
 data class CoreEventModel(
 	val id: String,
+	val revision: ULong,
 	val timestamp: Long,
 	val scope: String,
 	val transferId: ULong?,

shared/src/commonMain/kotlin/com/vnidrop/app/core/CoreRepository.kt

@@ -370,6 +370,7 @@ private fun RelaySettings.toNative(): CoreNetworkConfig = when (mode) {
 
 private fun CoreEvent.toModel(): CoreEventModel = CoreEventModel(
 	id = id,
+	revision = revision,
 	timestamp = timestamp,
 	scope = scope,
 	transferId = transferId,

shared/src/commonTest/kotlin/com/vnidrop/app/ui/state/AppUiModelsTest.kt

@@ -180,6 +180,7 @@ class AppUiModelsTest {
 			),
 			CoreEventModel(
 				id = "conn",
+				revision = 1UL,
 				timestamp = 1L,
 				scope = "endpoint",
 				transferId = null,
@@ -330,6 +331,7 @@ class AppUiModelsTest {
 		direction: String = "receive",
 	) = CoreEventModel(
 		id = id,
+		revision = 1UL,
 		timestamp = 1L,
 		scope = "transfer",
 		transferId = transferId,