[Content] Load content item skeleton loaders

[finnar-bin]

Added loading skeletons when loading a content item instead of the full screen loading indicator. Resolves #3352

Content---Zesty-io---zesty-pw---Manager.webm

[Copilot]

Pull Request Overview

This PR introduces skeleton loaders and other loading states to various content item widgets in the content editor for a smoother user experience while data is loading. Key changes include the conditional rendering of MUI Skeleton components in place of full content views, updates to optional chaining for safer data access, and the removal of unused components.

Reviewed Changes

Copilot reviewed 28 out of 30 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/apps/content-editor/src/app/views/ItemEdit/Content/ActionsDrawer/ActionsDrawer.js	Entire file removed—ensure that unused references to this component have been cleared.
src/apps/content-editor/src/app/views/ItemEdit/Content/Actions/Widgets/*	Updated multiple widget files (WidgetQuickShare, WidgetPurgeItem, WidgetPublishHistory, WidgetListed, WidgetDraftHistory, WidgetDeleteItem, Unpublish, etc.) by conditionally rendering Skeleton loaders when the item is loading.
src/apps/content-editor/src/app/views/ItemEdit/Content/Actions/Actions.js	Updated props destructuring to safely handle an undefined item and pass isLoadingItem to child components.
src/apps/content-editor/src/app/components/Editor/*	Added a new FieldsLoader component and modified the Editor to render it during loading.
src/apps/active-preview/index.html	Modified the loading screen with new background color and pulsate animation instead of the previous loader.

Files not reviewed (2)

• src/apps/content-editor/src/app/views/ItemEdit/Content/Actions/Widgets/WidgetQuickShare/WidgetQuickShare.less: Language not supported
• src/apps/content-editor/src/app/views/ItemEdit/Content/ActionsDrawer/ActionsDrawer.less: Language not supported

Comments suppressed due to low confidence (2)

src/apps/content-editor/src/app/views/ItemEdit/Content/ActionsDrawer/ActionsDrawer.js:1

• The entire file is removed. Ensure that any dependencies or references to ActionsDrawer have been updated or removed to prevent runtime errors.

-import { useState } from "react";

src/apps/active-preview/index.html:53

• [nitpick] Verify that the new pulsate animation achieves the desired visual effect without degrading performance, especially on lower-end devices.

animation: 2s ease-in-out 0.5s infinite normal none running pulsate;