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/inlines/footnote/src/footnote-node/footnote-popup.ts

@@ -1,6 +1,6 @@
 import {
   getAttachmentFileIcon,
-  getLoadingIconWith,
+  LoadingIcon,
   WebIcon16,
 } from '@blocksuite/affine-components/icons';
 import type { FootNote } from '@blocksuite/affine-model';
@@ -8,7 +8,6 @@ import { ImageProxyService } from '@blocksuite/affine-shared/adapters';
 import {
   DocDisplayMetaProvider,
   LinkPreviewServiceIdentifier,
-  ThemeProvider,
 } from '@blocksuite/affine-shared/services';
 import { unsafeCSSVar, unsafeCSSVarV2 } from '@blocksuite/affine-shared/theme';
 import { SignalWatcher, WithDisposable } from '@blocksuite/global/lit';
@@ -77,7 +76,7 @@ export class FootNotePopup extends SignalWatcher(WithDisposable(LitElement)) {
       return getAttachmentFileIcon(fileType);
     } else if (referenceType === 'url') {
       if (this._isLoading$.value) {
-        return this._LoadingIcon();
+        return LoadingIcon();
       }
 
       const favicon = this._linkPreview$.value?.favicon;
@@ -126,11 +125,6 @@ export class FootNotePopup extends SignalWatcher(WithDisposable(LitElement)) {
     return this._popupLabel$.value;
   });
 
-  private readonly _LoadingIcon = () => {
-    const theme = this.std.get(ThemeProvider).theme;
-    return getLoadingIconWith(theme);
-  };
-
   private readonly _onClick = () => {
     this.onPopupClick(this.footnote, this.abortController);
     this.abortController.abort();