refactor(ci): consolidate chromatic workflow setup into shared action

- Add `setup-env` input parameter to setup action for conditional env file copy
- Migrate chromatic.yml to use shared setup action with `setup-env: false`
- Replace `.node-version` with `.tool-versions` for asdf compatibility
- Chromatic now benefits from `--prefer-offline` optimization

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: devmgn

.github/actions/setup/action.yml

@@ -1,6 +1,12 @@
 name: 'Setup'
 description: 'Setup Node.js, pnpm, and install dependencies'
 
+inputs:
+  setup-env:
+    description: 'Whether to setup .env.local file'
+    required: false
+    default: 'true'
+
 runs:
   using: 'composite'
   steps:
@@ -10,13 +16,14 @@ runs:
     - name: Setup Node.js
       uses: actions/setup-node@395ad3262231945c25e8478fd5baf05154b1d79f # v6
       with:
-        node-version-file: '.node-version'
+        node-version-file: '.tool-versions'
         cache: 'pnpm'
 
     - name: Install dependencies
       shell: bash
       run: pnpm install --frozen-lockfile --prefer-offline
 
     - name: Setup environment
+      if: inputs.setup-env == 'true'
       shell: bash
       run: cp .env.development .env.local

.github/workflows/chromatic.yml

@@ -16,17 +16,10 @@ jobs:
         with:
           fetch-depth: 0
 
-      - name: Install pnpm
-        uses: pnpm/action-setup@v4
-
-      - name: Setup Node.js
-        uses: actions/setup-node@395ad3262231945c25e8478fd5baf05154b1d79f # v6
+      - name: Setup
+        uses: ./.github/actions/setup
         with:
-          node-version-file: '.node-version'
-          cache: 'pnpm'
-
-      - name: Install dependencies
-        run: pnpm install --frozen-lockfile
+          setup-env: 'false'
 
       - name: Publish to Chromatic
         uses: chromaui/action@latest

.node-version

@@ -0,0 +1,2 @@
+node 24.13.0
+pnpm 10.28.0