ci: 添加 PR 视觉一致性检查

.github/workflows/visual-compare.yml

@@ -0,0 +1,84 @@
+name: Visual Compare
+
+on:
+  pull_request:
+    branches:
+      - main
+
+permissions:
+  contents: read
+
+jobs:
+  visual-compare:
+    name: SVG Visual Consistency
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        id: checkout
+        uses: actions/checkout@v6
+        with:
+          # 需要 base 与 head 的原始提交对象（PR merge commit 的两个父）
+          fetch-depth: 0
+
+      - name: Setup mise
+        id: setup-mise
+        uses: jdx/mise-action@v2
+
+      # 对比工具维护在独立的孤儿分支上，与主仓库代码解耦
+      - name: Checkout tool branch
+        id: checkout-tool
+        uses: actions/checkout@v6
+        with:
+          ref: tools/svg-compare
+          path: svg-compare-tool
+
+      - name: Install tool dependencies
+        id: tool-install
+        working-directory: svg-compare-tool
+        run: bun install --frozen-lockfile
+
+      # major 版本不一致说明是有意的破坏性变更：仍然出报告，但不阻止合并
+      - name: Check major version
+        id: major-gate
+        run: |
+          base_sha='${{ github.event.pull_request.base.sha }}'
+          base_major=$(git show "$base_sha":package.json | jq -r '.version | split(".")[0]')
+          head_major=$(jq -r '.version | split(".")[0]' package.json)
+          echo "enforce=$([ "$base_major" = "$head_major" ] && echo true || echo false)" >> "$GITHUB_OUTPUT"
+          echo "base $base_major.x / head $head_major.x"
+
+      - name: Cache Playwright browsers
+        id: playwright-cache
+        uses: actions/cache@v4
+        with:
+          path: ~/.cache/ms-playwright
+          key: playwright-${{ runner.os }}-${{ hashFiles('svg-compare-tool/bun.lock') }}
+
+      - name: Install Playwright Chromium
+        id: playwright-install
+        working-directory: svg-compare-tool
+        run: bun x playwright install chromium --with-deps
+
+      - name: Compare base and head visually
+        id: compare
+        continue-on-error: ${{ steps.major-gate.outputs.enforce == 'false' }}
+        run: |
+          bun svg-compare-tool/cli.ts ci '${{ github.event.pull_request.base.sha }}' HEAD --via dist
+
+      - name: Enforce result
+        id: enforce
+        if: always() && steps.compare.outcome == 'failure'
+        run: |
+          if [ "${{ steps.major-gate.outputs.enforce }}" = "true" ]; then
+            exit 1
+          fi
+          echo "::warning::major 版本不一致，视觉差异仅报告不阻止合并"
+
+      - name: Upload report
+        id: upload-report
+        if: always()
+        uses: actions/upload-artifact@v7
+        with:
+          name: svg-compare-report
+          path: .svg-compare/