Fix React 19 peer conflicts breaking npm ci in Docker build

Dockerfile

@@ -4,9 +4,14 @@ FROM node:22-alpine AS build
 WORKDIR /app
 
 # Safety valve for the 2 GB host: without a cap a runaway build can exhaust the
-# server's RAM and take down neighbouring containers. Measured peak for this app
-# is ~550 MB, so 1 GB leaves headroom while still failing the build rather than
-# the server. Raise this only if the host gets more RAM.
+# server's RAM and take down neighbouring containers, so the build fails instead
+# of the server.
+#
+# Headroom is thinner than it used to be. The old note here recorded a ~550 MB
+# peak; after the React 19 upgrade and adding Astryx the build measures ~967 MB
+# peak RSS, which still completes under this cap but no longer leaves much room.
+# If a future dependency tips it over, raise this only alongside more host RAM —
+# not on its own, which just moves the failure from the build to the machine.
 ENV NODE_OPTIONS=--max-old-space-size=1024
 
 # Install deps from the lockfile first so this layer is reused when only src changes

package.json

@@ -11,7 +11,7 @@
   },
   "dependencies": {
     "@astryxdesign/core": "^0.4.3",
-    "@hello-pangea/dnd": "^17.0.0",
+    "@hello-pangea/dnd": "^18.0.1",
     "@hookform/resolvers": "^4.1.2",
     "@radix-ui/react-accordion": "^1.2.3",
     "@radix-ui/react-alert-dialog": "^1.1.6",
@@ -56,9 +56,7 @@
     "react-day-picker": "^10.0.1",
     "react-dom": "^19.2.8",
     "react-hook-form": "^7.54.2",
-    "react-leaflet": "^4.2.1",
     "react-markdown": "^9.0.1",
-    "react-quill": "^2.0.0",
     "react-resizable-panels": "^2.1.7",
     "react-router-dom": "^7.2.0",
     "recharts": "^2.15.4",