feat(editor): block comment extension (#12980)

#### PR Dependency Tree


* **PR #12980** 👈

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[Charcoal](https://github.com/danerwilliams/charcoal)

blocksuite/affine/blocks/image/src/components/page-image-block.ts

@@ -18,6 +18,7 @@ import type { BaseSelection } from '@blocksuite/store';
 import { computed } from '@preact/signals-core';
 import { css, html, type PropertyValues } from 'lit';
 import { property, query } from 'lit/decorators.js';
+import { classMap } from 'lit/directives/class-map.js';
 import { styleMap } from 'lit/directives/style-map.js';
 import { when } from 'lit/directives/when.js';
 
@@ -76,6 +77,10 @@ export class ImageBlockPageComponent extends SignalWatcher(
       width: 100%;
       height: 100%;
     }
+
+    affine-page-image .comment-highlighted {
+      outline: 2px solid ${unsafeCSSVarV2('block/comment/highlightUnderline')};
+    }
   `;
 
   resizeable$ = computed(() => this.block.resizeable$.value);
@@ -364,7 +369,13 @@ export class ImageBlockPageComponent extends SignalWatcher(
     const { loading, error, icon, description, needUpload } = this.state;
 
     return html`
-      <div class="resizable-img" style=${styleMap(imageSize)}>
+      <div
+        class=${classMap({
+          'resizable-img': true,
+          'comment-highlighted': this.block.isCommentHighlighted,
+        })}
+        style=${styleMap(imageSize)}
+      >
         <img
           class="drag-target"
           draggable="false"