Patch up to use a published patched meshcore-decoder and add a test script for different node versions

Dockerfile

@@ -6,7 +6,6 @@ ARG COMMIT_HASH=unknown
 WORKDIR /build
 
 COPY frontend/package.json frontend/.npmrc ./
-COPY frontend/lib/meshcore-decoder ./lib/meshcore-decoder
 RUN npm install
 
 COPY frontend/ ./

frontend/AGENTS.md

@@ -12,9 +12,9 @@ Keep it aligned with `frontend/src` source code.
 - Tailwind utility classes + local CSS (`index.css`, `styles.css`)
 - Sonner (toasts)
 - Leaflet / react-leaflet (map)
-- Vendored `@michaelhart/meshcore-decoder` in `frontend/lib/meshcore-decoder` (local file dependency for multibyte-support build)
+- `@michaelhart/meshcore-decoder` installed via npm alias to `meshcore-decoder-multibyte-patch`
 - `meshcore-hashtag-cracker` + `nosleep.js` (channel cracker)
-- `@michaelhart/meshcore-decoder` pinned to the multibyte-aware `jkingsman/meshcore-decoder-multibyte` fork
+- Multibyte-aware decoder build published as `meshcore-decoder-multibyte-patch`
 
 ## Frontend Map
 
@@ -141,8 +141,6 @@ frontend/src/
     ├── useWebSocket.dispatch.test.ts
     └── useWebSocket.lifecycle.test.ts
 
-frontend/lib/
-└── meshcore-decoder/      # Vendored local decoder package used by app + hashtag cracker
 ```
 
 ## Architecture Notes

frontend/package.json

@@ -17,7 +17,7 @@
   "dependencies": {
     "@codemirror/lang-python": "^6.2.1",
     "@codemirror/theme-one-dark": "^6.1.3",
-    "@michaelhart/meshcore-decoder": "file:./lib/meshcore-decoder",
+    "@michaelhart/meshcore-decoder": "npm:meshcore-decoder-multibyte-patch@0.2.7",
     "@radix-ui/react-checkbox": "^1.3.3",
     "@radix-ui/react-dialog": "^1.1.15",
     "@radix-ui/react-label": "^2.1.8",
@@ -67,7 +67,7 @@
   },
   "overrides": {
     "meshcore-hashtag-cracker": {
-      "@michaelhart/meshcore-decoder": "file:./lib/meshcore-decoder"
+      "@michaelhart/meshcore-decoder": "npm:meshcore-decoder-multibyte-patch@0.2.7"
     }
   }
 }

scripts/docker_ci.sh

@@ -0,0 +1,51 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+BLUE='\033[0;34m'
+NC='\033[0m'
+
+SCRIPT_DIR="$(cd "$(dirname "$0")/.." && pwd)"
+
+NODE_VERSIONS=("20" "22" "24")
+NPM_VERSIONS=("9" "10")
+
+echo -e "${YELLOW}=== Frontend Docker CI Matrix ===${NC}"
+echo -e "${BLUE}Repo:${NC} $SCRIPT_DIR"
+echo
+
+run_combo() {
+    local node_version="$1"
+    local npm_version="$2"
+    local image="node:${node_version}-slim"
+
+    echo -e "${YELLOW}=== Node ${node_version} / npm ${npm_version} ===${NC}"
+
+    docker run --rm \
+        -v "$SCRIPT_DIR:/src:ro" \
+        -w /tmp \
+        "$image" \
+        bash -lc "
+            set -euo pipefail
+            cp -a /src/frontend ./frontend
+            cd frontend
+            npm i -g npm@${npm_version}
+            echo 'Using Node:' \$(node -v)
+            echo 'Using npm:' \$(npm -v)
+            npm install
+            npm run build
+        "
+
+    echo -e "${GREEN}Passed:${NC} Node ${node_version} / npm ${npm_version}"
+    echo
+}
+
+for node_version in "${NODE_VERSIONS[@]}"; do
+    for npm_version in "${NPM_VERSIONS[@]}"; do
+        run_combo "$node_version" "$npm_version"
+    done
+done
+
+echo -e "${GREEN}=== Docker CI matrix passed ===${NC}"