perf(explorer): client side explorer (#1810)

* start work on client side explorer

* fix tests

* fmt

* generic test flag

* add prenav hook

* add highlight class

* make flex more consistent, remove transition

* open folders that are prefixes of current path

* make mobile look nice

* more style fixes

package.json

@@ -16,7 +16,7 @@
     "docs": "npx quartz build --serve -d docs",
     "check": "tsc --noEmit && npx prettier . --check",
     "format": "npx prettier . --write",
-    "test": "tsx ./quartz/util/path.test.ts && tsx ./quartz/depgraph.test.ts",
+    "test": "tsx --test",
     "profile": "0x -D prof ./quartz/bootstrap-cli.mjs build --concurrency=1"
   },
   "engines": {