feat: anchor links (#1765)

* feat: add heading extension with unique ID support and scroll functionality
* Added unique id for heading
* remove baseUrl heading storage
* move heading to extensions package
* WIP
* support anchors in mentions
* enhance scrolling functionality
* nodeId function
* fix nanoid import
* Bring unique-id extension local
* fixes
* fix internal link scroll in public pages
* add unique id server side
* rename mention anchor to anchorId
* capture first anchorId on paste

---------

Co-authored-by: Romik <40670677+RomikMakavana@users.noreply.github.com>

packages/editor-ext/src/lib/mention.ts

@@ -33,6 +33,11 @@ export interface MentionNodeAttrs {
    * the id of the user who initiated the mention
    */
   creatorId?: string;
+
+  /**
+   * the anchor hash for page mentions (e.g., "heading-1")
+   */
+  anchorId?: string;
 }
 
 export type MentionOptions<
@@ -246,6 +251,20 @@ export const Mention = Node.create<MentionOptions>({
           };
         },
       },
+
+      anchorId: {
+        default: null,
+        parseHTML: (element) => element.getAttribute("data-anchor-id"),
+        renderHTML: (attributes) => {
+          if (!attributes.anchorId) {
+            return {};
+          }
+
+          return {
+            "data-anchor-id": attributes.anchorId,
+          };
+        },
+      },
     };
   },