Add a way to reset the colors.

features/preferences/impl/src/main/kotlin/io/element/android/features/preferences/impl/developer/DeveloperSettingsEvents.kt

@@ -18,6 +18,6 @@ sealed interface DeveloperSettingsEvents {
     data class SetTracingLogLevel(val logLevel: LogLevelItem) : DeveloperSettingsEvents
     data class ToggleTracingLogPack(val logPack: TraceLogPack, val enabled: Boolean) : DeveloperSettingsEvents
     data class SetShowColorPicker(val show: Boolean) : DeveloperSettingsEvents
-    data class ChangeBrandColor(val color: Color) : DeveloperSettingsEvents
+    data class ChangeBrandColor(val color: Color?) : DeveloperSettingsEvents
     data object ClearCache : DeveloperSettingsEvents
 }

features/preferences/impl/src/main/kotlin/io/element/android/features/preferences/impl/developer/DeveloperSettingsPresenter.kt

@@ -144,7 +144,7 @@ class DeveloperSettingsPresenter(
                 }
                 is DeveloperSettingsEvents.ChangeBrandColor -> {
                     showColorPicker = false
-                    val color = event.color.value.toHexString(HexFormat.UpperCase).substring(2, 8)
+                    val color = event.color?.value?.toHexString(HexFormat.UpperCase)?.substring(2, 8)
                     enterpriseService.overrideBrandColor(color)
                 }
                 is DeveloperSettingsEvents.SetShowColorPicker -> {

features/preferences/impl/src/main/kotlin/io/element/android/features/preferences/impl/developer/DeveloperSettingsView.kt

@@ -112,6 +112,14 @@ fun DeveloperSettingsView(
                         state.eventSink(DeveloperSettingsEvents.SetShowColorPicker(true))
                     }
                 )
+                ListItem(
+                    headlineContent = {
+                        Text("Reset brand color")
+                    },
+                    onClick = {
+                        state.eventSink(DeveloperSettingsEvents.ChangeBrandColor(null))
+                    }
+                )
             }
         }
         PreferenceCategory(title = "Crash") {