Add content scanner support to media gallery and viewer (Element Pro) (#7233)

* Add content scanner support to media gallery and viewer

* Improve UI and previews

* Remove default content validation state in media content views

* Disable click for invalid media items in the gallery events

* Update screenshots

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Co-authored-by: ElementBot <android@element.io>

libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/media/contentvalidation/ContentValidationState.kt

@@ -116,6 +116,7 @@ class DefaultContentValidationState(
 
 private fun calculateOverallState(states: Map<String, ContentValidationValue>): ContentValidationValue {
     return when {
+        states.values.isEmpty() -> ContentValidationValue.Unknown
         states.values.any { it is ContentValidationValue.Invalid } -> ContentValidationValue.Invalid
         states.values.any { it is ContentValidationValue.Loading } -> ContentValidationValue.Loading
         states.values.any { it is ContentValidationValue.UnrecoverableError } -> states.values.first { it is ContentValidationValue.UnrecoverableError }

libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/media/contentvalidation/LocalEventContentValidationState.kt

@@ -26,8 +26,10 @@ val LocalEventContentValidationState = staticCompositionLocalOf<EventContentVali
 /**
  * A noop implementation of the [EventContentValidationCache] that immediately returns a successful validation state. This will be used in FOSS.
  */
-class NoopEventContentValidationCache : EventContentValidationCache {
-    override operator fun get(eventId: EventId): ContentValidationState = noopValue
+class NoopEventContentValidationCache(
+    private val provided: ContentValidationState = noopValue,
+) : EventContentValidationCache {
+    override operator fun get(eventId: EventId): ContentValidationState = provided
 }
 
 /**