Enable detekt rules UnusedImports and cleanup the code.

libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/auth/OidcConfig.kt

@@ -16,8 +16,8 @@
 
 package io.element.android.libraries.matrix.impl.auth
 
-import io.element.android.libraries.matrix.api.auth.OidcConfig
 // TODO Oidc
+// import io.element.android.libraries.matrix.api.auth.OidcConfig
 // import org.matrix.rustcomponents.sdk.OidcClientMetadata
 
 /*

libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/media/ImageInfo.kt

@@ -17,7 +17,6 @@
 package io.element.android.libraries.matrix.impl.media
 
 import io.element.android.libraries.matrix.api.media.ImageInfo
-import org.matrix.rustcomponents.sdk.MediaSource
 import org.matrix.rustcomponents.sdk.ImageInfo as RustImageInfo
 
 fun RustImageInfo.map(): ImageInfo = ImageInfo(

libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/timeline/postprocessor/TimelineEncryptedHistoryPostProcessor.kt

@@ -22,7 +22,6 @@ import io.element.android.libraries.matrix.api.timeline.item.virtual.VirtualTime
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.getAndUpdate
 import java.util.Date
-import java.util.UUID
 
 class TimelineEncryptedHistoryPostProcessor(
     private val lastLoginTimestamp: Date?,
@@ -70,5 +69,4 @@ class TimelineEncryptedHistoryPostProcessor(
         val timestamp = (item as? MatrixTimelineItem.Event)?.event?.timestamp ?: return false
         return timestamp <= lastLoginTimestamp!!.time
     }
-
 }