Add function to clear image cache

Caps/Views/SettingsView.swift

@@ -54,6 +54,12 @@ struct SettingsView: View {
                     SettingsStatisticRow(label: "Image cache", value: byteString(imageCacheSize))
                     SettingsStatisticRow(label: "Database", value: byteString(database.databaseSize))
                     SettingsStatisticRow(label: "Classifier", value: byteString(database.classifierSize))
+                    HStack {
+                        Spacer()
+                        Button("Clear image cache", action: clearImageCache)
+                            .padding()
+                        Spacer()
+                    }
                 }.padding(.horizontal)
                 Spacer()
             }
@@ -64,8 +70,15 @@ struct SettingsView: View {
     }
     
     private func updateImageCacheSize() {
+        imageCacheSize = database.imageCacheSize()
+    }
+
+    private func clearImageCache() {
         Task {
-            imageCacheSize = await database.imageCacheSize()
+            database.clearImageCache()
+            DispatchQueue.main.async {
+                updateImageCacheSize()
+            }
         }
     }