chore: merge blocksuite source code (#9213)

blocksuite/playground/style.css

@@ -0,0 +1,12 @@
+@import '@toeverything/theme/style.css';
+
+@font-face {
+  font-family: 'color-emoji';
+  src: local('Apple Color Emoji'), local('Segoe UI Emoji'),
+    local('Segoe UI Symbol'), local('Noto Color Emoji');
+  unicode-range: U+1F000-1F644, U+203C-3299;
+}
+
+.dg > ul {
+  overflow: scroll;
+}