refactor: unify theme (#1303)

apps/web/src/utils/create-emotion-cache.ts

@@ -0,0 +1,17 @@
+import { getEnvironment } from '@affine/env';
+import createCache from '@emotion/cache';
+
+const isBrowser = getEnvironment().isBrowser;
+
+export default function createEmotionCache() {
+  let insertionPoint;
+
+  if (isBrowser) {
+    const emotionInsertionPoint = document.querySelector<HTMLMetaElement>(
+      'meta[name="emotion-insertion-point"]'
+    );
+    insertionPoint = emotionInsertionPoint ?? undefined;
+  }
+
+  return createCache({ key: 'affine-style', insertionPoint });
+}