feat(core): use emoji as folder icon (#7842)

![CleanShot 2024-08-12 at 22.33.42.png](https://graphite-user-uploaded-assets-prod.s3.amazonaws.com/g3jz87HxbjOJpXV3FPT7/c0c1a196-be29-4e45-a28d-87a55d80fc9d.png)

yarn.lock

@@ -444,6 +444,7 @@ __metadata:
     fractional-indexing: "npm:^3.2.0"
     fractional-indexing-jittered: "npm:^0.9.1"
     fuse.js: "npm:^7.0.0"
+    graphemer: "npm:^1.4.0"
     graphql: "npm:^16.8.1"
     history: "npm:^5.3.0"
     idb: "npm:^8.0.0"