fix(editor): loading style (#12537)

Closes: [BS-3555](https://linear.app/affine-design/issue/BS-3555/ui-attachment-loading-变量更新)
Closes: [BS-3559](https://linear.app/affine-design/issue/BS-3559/ui-图片-loading-变量更新)

### Dark
<img width="625" alt="Screenshot 2025-05-26 at 20 32 36" src="https://github.com/user-attachments/assets/93501e3d-8fc6-45f9-84a0-ac147e5c5f9f" />

### Light
<img width="623" alt="Screenshot 2025-05-26 at 20 32 25" src="https://github.com/user-attachments/assets/7d5bc128-6667-45b5-982d-dab3a22706a7" />

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit

- **New Features**
  - Loading icons are now invoked as functions, allowing for more flexible and customizable rendering with parameters like size and progress.

- **Refactor**
  - Replaced theme-dependent and static loading icon references with a unified `LoadingIcon()` component across multiple components and blocks.
  - Removed legacy icon variants and simplified icon import statements, centralizing icon rendering logic.

- **Style**
  - Updated styles for loading and reload buttons to use theme-aware CSS variables.
  - Enlarged and repositioned loading indicators in image blocks for better visibility.

- **Bug Fixes**
  - Achieved consistent loading icon rendering across various blocks and components by standardizing icon invocation.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

blocksuite/affine/blocks/embed-doc/src/embed-synced-doc-block/utils.ts

@@ -1,8 +1,6 @@
 import {
   EmbedEdgelessIcon,
   EmbedPageIcon,
-  getLoadingIconWith,
-  ReloadIcon,
 } from '@blocksuite/affine-components/icons';
 import { ColorScheme } from '@blocksuite/affine-model';
 import type { BlockComponent } from '@blocksuite/std';
@@ -21,11 +19,9 @@ import {
 } from './styles.js';
 
 type SyncedCardImages = {
-  LoadingIcon: TemplateResult<1>;
   SyncedDocIcon: TemplateResult<1>;
   SyncedDocErrorIcon: TemplateResult<1>;
   SyncedDocDeletedIcon: TemplateResult<1>;
-  ReloadIcon: TemplateResult<1>;
   SyncedDocEmptyBanner: TemplateResult<1>;
   SyncedDocErrorBanner: TemplateResult<1>;
   SyncedDocDeletedBanner: TemplateResult<1>;
@@ -35,25 +31,20 @@ export function getSyncedDocIcons(
   theme: ColorScheme,
   editorMode: 'page' | 'edgeless'
 ): SyncedCardImages {
-  const LoadingIcon = getLoadingIconWith(theme);
   if (theme === ColorScheme.Light) {
     return {
-      LoadingIcon,
       SyncedDocIcon: editorMode === 'page' ? EmbedPageIcon : EmbedEdgelessIcon,
       SyncedDocErrorIcon,
       SyncedDocDeletedIcon,
-      ReloadIcon,
       SyncedDocEmptyBanner: LightSyncedDocEmptyBanner,
       SyncedDocErrorBanner: LightSyncedDocErrorBanner,
       SyncedDocDeletedBanner: LightSyncedDocDeletedBanner,
     };
   } else {
     return {
-      LoadingIcon,
       SyncedDocIcon: editorMode === 'page' ? EmbedPageIcon : EmbedEdgelessIcon,
       SyncedDocErrorIcon,
       SyncedDocDeletedIcon,
-      ReloadIcon,
       SyncedDocEmptyBanner: DarkSyncedDocEmptyBanner,
       SyncedDocErrorBanner: DarkSyncedDocErrorBanner,
       SyncedDocDeletedBanner: DarkSyncedDocDeletedBanner,