Fix front end chunking and add workflow dispatch to deploy previous release to prod (#646)

Author: petebachant

.github/workflows/deploy-production.yml

@@ -6,6 +6,12 @@ on:
   release:
     types:
       - published
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: "Published release tag to deploy, e.g. v1.2.3. Use this to roll back by redeploying a previous release."
+        required: true
+        type: string
 
 jobs:
   deploy:
@@ -49,7 +55,29 @@ jobs:
       GOOGLE_CLIENT_SECRET: ${{ secrets.GOOGLE_CLIENT_SECRET }}
       GRAFANA_ADMIN_PASSWORD: ${{ secrets.GRAFANA_ADMIN_PASSWORD }}
     steps:
+      - name: Resolve and validate release tag
+        id: tag
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          if [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
+            TAG="${{ inputs.tag }}"
+          else
+            TAG="${{ github.event.release.tag_name }}"
+          fi
+          echo "Validating release tag: $TAG"
+          status=$(curl -sS -o /dev/null -w '%{http_code}' \
+            -H "Authorization: Bearer $GH_TOKEN" \
+            -H "Accept: application/vnd.github+json" \
+            "https://api.github.com/repos/${{ github.repository }}/releases/tags/$TAG")
+          if [ "$status" != "200" ]; then
+            echo "::error::'$TAG' is not a published release (HTTP $status); only tagged releases can be deployed."
+            exit 1
+          fi
+          echo "tag=$TAG" >> "$GITHUB_OUTPUT"
       - name: Checkout
         uses: actions/checkout@v7
+        with:
+          ref: ${{ steps.tag.outputs.tag }}
       - run: docker compose -f docker-compose.yml --project-name ${{ vars.STACK_NAME }} build
       - run: docker compose -f docker-compose.yml --project-name ${{ vars.STACK_NAME }} up -d

frontend/vite.config.ts

@@ -31,11 +31,13 @@ export default defineConfig({
             return "vendor-plotly"
           }
 
-          // Mermaid and its rendering graph (d3, dagre, khroma, cytoscape,
-          // elkjs) must stay in ONE chunk. Splitting this tightly-coupled,
-          // circular dependency graph across chunks reorders module init and
-          // triggers a "Cannot access 'x' before initialization" TDZ error in
-          // mermaid's theme code on load.
+          // Let mermaid and its rendering graph (d3, dagre, khroma, cytoscape,
+          // elkjs, lodash-es) auto-chunk. Mermaid lazy-loads each diagram type
+          // via internal dynamic import(); forcing the graph into one manual
+          // chunk collapses those async boundaries into synchronous circular
+          // references, which throw "Cannot access 'x' before initialization"
+          // TDZ errors during theme setup and rendering. Returning undefined
+          // lets Rollup preserve mermaid's internal async chunk boundaries.
           if (
             id.includes("mermaid") ||
             id.includes("/d3-") ||
@@ -44,17 +46,24 @@ export default defineConfig({
             id.includes("khroma") ||
             id.includes("cytoscape") ||
             id.includes("elkjs") ||
-            id.includes("non-layered-tidy-tree-layout")
+            id.includes("non-layered-tidy-tree-layout") ||
+            id.includes("lodash-es")
           ) {
-            return "vendor-mermaid"
+            return undefined
           }
 
+          // react-ipynb-renderer, mathjax and katex form an interdependent
+          // graph that also cross-imports the markdown/syntax chunks (and katex
+          // is pulled in by mermaid). Force-merging them into one chunk creates
+          // circular chunk dependencies whose const/class bindings evaluate out
+          // of order, throwing "Cannot access 'x' before initialization" TDZ
+          // errors on load. Let Rollup auto-chunk this graph instead.
           if (
             id.includes("react-ipynb-renderer") ||
             id.includes("mathjax") ||
             id.includes("katex")
           ) {
-            return "vendor-notebooks"
+            return undefined
           }
 
           if (