test(core): align emoji vertical-nav expectation with grapheme-boundary snap

The parent commit changed vertical cursor movement to snap visual
columns to grapheme leading boundaries. The JS test still expected the
cursor to land on visualCol 8, the second cell of the wide emoji
grapheme; it now expects the snapped leading boundary 7.

Author: 3aKHP

packages/core/src/editor-view.test.ts

@@ -523,7 +523,8 @@ describe("EditorView", () => {
       view.moveDownVisual()
       cursor = view.getVisualCursor()
       expect(cursor.visualRow).toBe(1)
-      expect(cursor.visualCol).toBe(8)
+      // Col 8 sits inside 🌟 (cells 7-8); vertical movement snaps to the leading boundary.
+      expect(cursor.visualCol).toBe(7)
 
       buffer.moveCursorLeft()
       cursor = view.getVisualCursor()