feat: internal page links and mentions (#604)

* Work on mentions

* fix: properly parse page slug

* fix editor suggestion bugs

* mentions must start with whitespace

* add icon to page mention render

* feat: backlinks - WIP

* UI - WIP

* permissions check
* use FTS for page suggestion

* cleanup

* WIP

* page title fallback

* feat: handle internal link paste

* link styling

* WIP

* Switch back to LIKE operator for search suggestion

* WIP
* scope to workspaceId
* still create link for pages not found

* select necessary columns

* cleanups

apps/server/src/collaboration/collaboration.util.ts

@@ -31,6 +31,7 @@ import {
   Drawio,
   Excalidraw,
   Embed,
+  Mention
 } from '@docmost/editor-ext';
 import { generateText, getSchema, JSONContent } from '@tiptap/core';
 import { generateHTML } from '../common/helpers/prosemirror/html';
@@ -75,6 +76,7 @@ export const tiptapExtensions = [
   Drawio,
   Excalidraw,
   Embed,
+  Mention
 ] as any;
 
 export function jsonToHtml(tiptapJson: any) {