Upgrade blocknote dependencies from 0.31.1 to 0.47.0. (#18207)

This PR pgrades all BlockNote packages (@blocknote/core,
@blocknote/react, @blocknote/mantine, @blocknote/server-util,
@blocknote/xl-docx-exporter, @blocknote/xl-pdf-exporter) to 0.47.0 and
adapts the codebase to the new API.

### Changes
- Dependency upgrades: Bumped all BlockNote packages to 0.47.0, added
required Mantine v8 peer dependencies, removed unnecessary prosemirror
resolutions
- Formatting toolbar: Replaced the manual reimplementation of
FormattingToolbarController (which handled visibility, positioning,
portal rendering, text-alignment-based placement, and a
dangerouslySetInnerHTML transition trick) with BlockNote's built-in
FormattingToolbarController. The toolbar buttons themselves are
unchanged.
- Side menu: Replaced manual drag handle menu positioning and rendering
(DashboardBlockDragHandleMenu, DashboardBlockColorPicker, and their
floating configs) with BlockNote's built-in SideMenuController,
DragHandleButton, and DragHandleMenu components. Deleted 4 files that
became dead code.
- Extension API migration: Replaced deprecated editor.suggestionMenus
and editor.formattingToolbar APIs with the new extension system
(SuggestionMenu, useExtensionState, editor.getExtension())
- Slash menu fixes: Filtered out BlockNote's new default "File" item
(added in 0.47) to avoid duplicates with our custom one; added icon
mappings for new block types (Toggle List, Divider, Toggle Headings,
Headings 4-6)
- Server-side: Switched @blocknote/server-util to dynamic import() to
handle ESM-only transitive dependencies in CJS context

packages/twenty-front/src/modules/blocknote-editor/utils/getSlashMenu.ts

@@ -1,6 +1,6 @@
 import { getDefaultReactSlashMenuItems } from '@blocknote/react';
 
-import { type SuggestionItem } from '@/blocknote-editor/components/CustomSlashMenu';
+import { type SuggestionItem } from '@/blocknote-editor/types/types';
 
 import { type BLOCK_SCHEMA } from '@/blocknote-editor/blocks/Schema';
 import {
@@ -11,10 +11,15 @@ import {
   IconH1,
   IconH2,
   IconH3,
+  IconH4,
+  IconH5,
+  IconH6,
   IconHeadphones,
   IconList,
   IconListCheck,
+  IconListDetails,
   IconListNumbers,
+  IconMinus,
   IconMoodSmile,
   IconPhoto,
   IconPilcrow,
@@ -26,6 +31,14 @@ const Icons: Record<string, IconComponent> = {
   'Heading 1': IconH1,
   'Heading 2': IconH2,
   'Heading 3': IconH3,
+  'Heading 4': IconH4,
+  'Heading 5': IconH5,
+  'Heading 6': IconH6,
+  'Toggle Heading 1': IconH1,
+  'Toggle Heading 2': IconH2,
+  'Toggle Heading 3': IconH3,
+  'Toggle List': IconListDetails,
+  Divider: IconMinus,
   Quote: IconBlockquote,
   'Numbered List': IconListNumbers,
   'Bullet List': IconList,
@@ -41,10 +54,12 @@ const Icons: Record<string, IconComponent> = {
 
 export const getSlashMenu = (editor: typeof BLOCK_SCHEMA.BlockNoteEditor) => {
   const items: SuggestionItem[] = [
-    ...getDefaultReactSlashMenuItems(editor).map((x) => ({
-      ...x,
-      Icon: Icons[x.title],
-    })),
+    ...getDefaultReactSlashMenuItems(editor)
+      .filter((item) => item.title !== 'File')
+      .map((x) => ({
+        ...x,
+        Icon: Icons[x.title],
+      })),
     {
       title: 'File',
       aliases: ['file', 'folder'],