refactor(setup): consolidate prettier config and streamline CI

- Replace scattered .prettierignore files with a single root config
- Add scripts/ci.js to orchestrate lint, format, typecheck, commitlint, and build
- Simplify ci.yml to use ci.js and npm ci
- Apply prettier formatting to docs, locales, and HTML files

.github/workflows/ci.yml

@@ -1,6 +1,6 @@
+name: CI
 permissions:
   contents: read
-name: CI
 
 on:
   push:
@@ -17,6 +17,8 @@ jobs:
 
     steps:
       - uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
 
       - name: Setup Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v6
@@ -24,18 +26,8 @@ jobs:
           node-version: ${{ matrix.node-version }}
           cache: 'npm'
 
-      # test on default version of npm
-      # - 9.6~10.8 on node@20
-      # - 11.3~11.6 on node@24
-
-      - name: Node and NPM version
-        run: node --version && npm --version
-
       - name: Install dependencies
-        run: npm install
+        run: npm ci
 
-      - name: Lint
-        run: npx eslint . && npx prettier --check **/*.ts
-
-      - name: Build
-        run: npm run build
+      - name: CI checks
+        run: node scripts/ci.js