enable sidebar layout via layers-input.json config

Author: cboettig

layers-input.json

@@ -2,6 +2,11 @@
     "catalog": "https://s3-west.nrp-nautilus.io/public-data/stac/catalog.json",
     "titiler_url": "https://titiler.nrp-nautilus.io",
     "mcp_url": "https://duckdb-mcp.nrp-nautilus.io/mcp",
+    "sidebar": {
+        "enabled": true,
+        "default_width": 420,
+        "title": "Data Assistant"
+    },
     "view": {
         "center": [
             -75,