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

#### PR Dependency Tree


* **PR #12980** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

blocksuite/affine/blocks/database/src/components/title/index.ts

@@ -1,3 +1,4 @@
+import { unsafeCSSVarV2 } from '@blocksuite/affine-shared/theme';
 import { stopPropagation } from '@blocksuite/affine-shared/utils';
 import type { DataViewUILogicBase } from '@blocksuite/data-view';
 import { SignalWatcher, WithDisposable } from '@blocksuite/global/lit';
@@ -72,6 +73,12 @@ export class DatabaseTitle extends SignalWatcher(
     .affine-database-title [data-title-focus='true']::before {
       color: var(--affine-placeholder-color);
     }
+
+    .affine-database-title.comment-highlighted {
+      border-bottom: 2px solid
+        ${unsafeCSSVarV2('block/comment/highlightUnderline')};
+      background-color: ${unsafeCSSVarV2('block/comment/highlightActive')};
+    }
   `;
 
   private readonly compositionEnd = () => {
@@ -134,6 +141,7 @@ export class DatabaseTitle extends SignalWatcher(
     const classList = classMap({
       'affine-database-title': true,
       ellipsis: !this.isFocus$.value,
+      'comment-highlighted': this.database?.isCommentHighlighted ?? false,
     });
     const untitledStyle = styleMap({
       height: isEmpty ? 'auto' : 0,

blocksuite/affine/blocks/database/src/database-block.ts

@@ -10,6 +10,8 @@ import { toast } from '@blocksuite/affine-components/toast';
 import type { DatabaseBlockModel } from '@blocksuite/affine-model';
 import { EDGELESS_TOP_CONTENTEDITABLE_SELECTOR } from '@blocksuite/affine-shared/consts';
 import {
+  BlockCommentManager,
+  CommentProviderIdentifier,
   DocModeProvider,
   NotificationProvider,
   type TelemetryEventMap,
@@ -34,11 +36,12 @@ import {
 import { widgetPresets } from '@blocksuite/data-view/widget-presets';
 import { Rect } from '@blocksuite/global/gfx';
 import {
+  CommentIcon,
   CopyIcon,
   DeleteIcon,
   MoreHorizontalIcon,
 } from '@blocksuite/icons/lit';
-import { type BlockComponent } from '@blocksuite/std';
+import { type BlockComponent, BlockSelection } from '@blocksuite/std';
 import { RANGE_SYNC_EXCLUDE_ATTR } from '@blocksuite/std/inline';
 import { Slice } from '@blocksuite/store';
 import { autoUpdate } from '@floating-ui/dom';
@@ -82,6 +85,18 @@ export class DatabaseBlockComponent extends CaptionedBlockComponent<DatabaseBloc
             );
           },
         }),
+        menu.action({
+          prefix: CommentIcon(),
+          name: 'Comment',
+          hide: () => !this.std.getOptional(CommentProviderIdentifier),
+          select: () => {
+            this.std.getOptional(CommentProviderIdentifier)?.addComment([
+              new BlockSelection({
+                blockId: this.blockId,
+              }),
+            ]);
+          },
+        }),
         menu.action({
           prefix: CopyIcon(),
           name: 'Copy',
@@ -297,6 +312,12 @@ export class DatabaseBlockComponent extends CaptionedBlockComponent<DatabaseBloc
     };
   }
 
+  get isCommentHighlighted() {
+    return this.std
+      .get(BlockCommentManager)
+      .isBlockCommentHighlighted(this.model);
+  }
+
   override get topContenteditableElement() {
     if (this.std.get(DocModeProvider).getEditorMode() === 'edgeless') {
       return this.closest<BlockComponent>(