feat: enhance table cells with rich content support (#1409)

- Support multiple content types in table cells and headers: paragraphs, headings, lists (bullet/ordered/task), blockquotes, callouts, images, videos, attachments, math blocks, toggles, and code blocks
- Add custom table extension with smart Tab key handling for list indentation within tables
- Preserve default table navigation when not in lists

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

@@ -10,7 +10,6 @@ import { Typography } from '@tiptap/extension-typography';
 import { TextStyle } from '@tiptap/extension-text-style';
 import { Color } from '@tiptap/extension-color';
 import { Youtube } from '@tiptap/extension-youtube';
-import Table from '@tiptap/extension-table';
 import {
   Callout,
   Comment,
@@ -24,6 +23,7 @@ import {
   TableHeader,
   TableCell,
   TableRow,
+  CustomTable,
   TiptapImage,
   TiptapVideo,
   TrailingNode,
@@ -65,7 +65,7 @@ export const tiptapExtensions = [
   Details,
   DetailsContent,
   DetailsSummary,
-  Table,
+  CustomTable,
   TableCell,
   TableRow,
   TableHeader,