feat: add 'three' keyword synonym for three column component

- Add 'three', '3', and 'columns' to keywords array in columnsThree configuration
- Enables users to type 'three' in slash command to find three column component
- Follows existing pattern from numberedList component which includes '1' keyword

Co-Authored-By: nate@buster.so <nate@buster.so>

apps/web/src/components/ui/report/config/labels.tsx

@@ -73,7 +73,7 @@ export const NodeTypeLabels = {
   columnsThree: {
     label: '3 columns',
     keyboard: undefined,
-    keywords: []
+    keywords: ['three', '3', 'columns']
   },
 
   // Text formatting