feat: placeholder color and text

Author: peterpeterparker

studio/src/app/popovers/editor/app-image/app-image.scss

@@ -18,6 +18,10 @@ app-image {
     &.action-button {
       --min-height: 42px;
     }
+
+    &.history-empty {
+      --color: var(--ion-color-medium);
+    }
   }
 
   ion-item-divider {

studio/src/app/popovers/editor/app-image/app-image.tsx

@@ -154,8 +154,8 @@ export class AppImage {
 
     private renderPhotosHistory() {
         if (!this.photosHistoryOdd && !this.photosHistoryEven) {
-            return <ion-item>
-                <ion-label>Empty</ion-label>
+            return <ion-item class="history-empty">
+                <ion-label class="ion-text-wrap"><small>You have not used any photos so far</small></ion-label>
             </ion-item>
         } else {
             return <div class="history-photos ion-padding">