build(editor): blog editor JS build and drift gate

- Private ESM package with exact pins: @tiptap/core, pm, starter-kit,
  extension-table and extension-image 3.31.4; vite 7.3.5, vitest 3.2.7,
  happy-dom 20.11.6 and typescript 5.9.3, the admin SPA toolchain
- vite.config.ts builds assets/src/blogeditor/index.ts into fixed-name
  assets/dist/blogeditor.js and blogeditor.css, minified, and runs vitest
  on happy-dom
- scripts/check-dist.sh rebuilds into a temp dir and fails when assets/dist
  is stale; node_modules is ignored

.gitignore

@@ -0,0 +1 @@
+node_modules/

package.json

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+{
+  "name": "golem15-journal-blogeditor",
+  "private": true,
+  "type": "module",
+  "engines": {
+    "node": ">=22.6"
+  },
+  "scripts": {
+    "typecheck": "tsc --noEmit",
+    "build": "tsc --noEmit && vite build",
+    "test": "vitest run"
+  },
+  "dependencies": {
+    "@tiptap/core": "3.31.4",
+    "@tiptap/extension-image": "3.31.4",
+    "@tiptap/extension-table": "3.31.4",
+    "@tiptap/pm": "3.31.4",
+    "@tiptap/starter-kit": "3.31.4"
+  },
+  "devDependencies": {
+    "happy-dom": "20.11.6",
+    "typescript": "5.9.3",
+    "vite": "7.3.5",
+    "vitest": "3.2.7"
+  }
+}

scripts/check-dist.sh

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+#!/usr/bin/env bash
+# Drift gate for the committed Blog Editor bundle (D-16). Rebuilds the element
+# from the committed lockfile into a temporary directory and fails when the
+# result differs from assets/dist, the files admin.go embeds. After changing
+# assets/src, rebuild with `npm run build` and commit assets/dist.
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+cd "$ROOT"
+
+if [[ ! -d node_modules ]]; then
+  npm ci
+fi
+
+npm run typecheck
+
+TMP="$(mktemp -d)"
+trap 'rm -rf "$TMP"' EXIT
+
+node_modules/.bin/vite build --outDir "$TMP/dist" --emptyOutDir --logLevel warn
+
+if ! diff -r "$TMP/dist" assets/dist; then
+  echo "check-dist: assets/dist is stale; run npm run build and commit assets/dist" >&2
+  exit 1
+fi
+echo "check-dist: assets/dist matches a fresh build"

tsconfig.json

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+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "lib": ["ES2022", "DOM", "DOM.Iterable"],
+    "strict": true,
+    "noEmit": true,
+    "isolatedModules": true,
+    "skipLibCheck": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noFallthroughCasesInSwitch": true,
+    "types": ["vite/client", "node"]
+  },
+  "include": ["assets/src", "tests", "vite.config.ts"]
+}

vite.config.ts

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+import { defineConfig } from 'vitest/config'
+
+// Build of the Blog Editor custom element (D-16): one ES module entry,
+// assets/src/blogeditor/index.ts, loaded by the admin SPA as a module script.
+// It is built like a library entry (exports kept, fixed output names with no
+// content hash; cabana appends ?v=<sha256 prefix> itself) but through the
+// application pipeline, because Vite's library mode never minifies
+// whitespace in ES output. The bundle and its stylesheet are committed under
+// assets/dist and embedded through admin.go; scripts/check-dist.sh fails
+// when they are stale.
+export default defineConfig({
+  build: {
+    outDir: 'assets/dist',
+    emptyOutDir: true,
+    target: 'es2022',
+    modulePreload: false,
+    copyPublicDir: false,
+    reportCompressedSize: true,
+    rollupOptions: {
+      input: 'assets/src/blogeditor/index.ts',
+      preserveEntrySignatures: 'exports-only',
+      output: {
+        format: 'es',
+        entryFileNames: 'blogeditor.js',
+        chunkFileNames: 'blogeditor-[name].js',
+        assetFileNames: 'blogeditor[extname]',
+        inlineDynamicImports: true,
+      },
+    },
+  },
+  test: {
+    environment: 'happy-dom',
+    include: ['tests/**/*.test.ts'],
+  },
+})