feat(slash): insert footnote command

packages/ckeditor5/src/extra_slash_commands.ts

@@ -1,13 +1,15 @@
 import type { Editor } from 'ckeditor5';
 import type { SlashCommandEditorConfig  } from 'ckeditor5-premium-features';
 import { icons as admonitionIcons } from '@triliumnext/ckeditor5-admonition';
+import { icons as footnoteIcons } from '@triliumnext/ckeditor5-footnotes';
 import { ADMONITION_TYPES, type AdmonitionType } from '@triliumnext/ckeditor5-admonition';
 
 type SlashCommandDefinition = SlashCommandEditorConfig["extraCommands"][number];
 
 export default function buildExtraCommands(): SlashCommandDefinition[] {
     return [
-        ...buildAdmonitionExtraCommands()
+        ...buildAdmonitionExtraCommands(),
+        ...buildFootnoteExtraCommands()
     ];
 }
 
@@ -23,3 +25,15 @@ function buildAdmonitionExtraCommands(): SlashCommandDefinition[] {
     }
     return commands;
 }
+
+function buildFootnoteExtraCommands(): SlashCommandDefinition[] {
+    return [
+        {
+            id: 'footnote',
+            title: 'Footnote',
+            description: 'Create a new footnote and reference it here',
+            icon: footnoteIcons.insertFootnoteIcon,
+            execute: (editor: Editor) => editor.execute("InsertFootnote")
+        }
+    ];
+}