ci: size report (#6082)

## Summary

show bundle size info automatically in Pull Request

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6082-ci-size-report-28e6d73d365081c2bf73ce9919a7c01a)
by [Unito](https://www.unito.io)

.github/workflows/size-data.yml

@@ -0,0 +1,52 @@
+name: size data
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+permissions:
+  contents: read
+
+jobs:
+  collect:
+    if: github.repository == 'Comfy-Org/ComfyUI_frontend'
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v5
+
+      - name: Install pnpm
+        uses: pnpm/action-setup@v4.1.0
+        with:
+          version: 10
+
+      - name: Install Node.js
+        uses: actions/setup-node@v5
+        with:
+          node-version: '24.x'
+          cache: pnpm
+
+      - name: Install dependencies
+        run: pnpm install
+
+      - name: Build project
+        run: pnpm build
+
+      - name: Collect size data
+        run: node scripts/size-collect.js
+
+      - name: Save PR number & base branch
+        if: ${{ github.event_name == 'pull_request' }}
+        run: |
+          echo ${{ github.event.number }} > ./temp/size/number.txt
+          echo ${{ github.base_ref }} > ./temp/size/base.txt
+
+      - name: Upload size data
+        uses: actions/upload-artifact@v4
+        with:
+          name: size-data
+          path: temp/size