refactor: reorganize GitHub Actions for better reusability

This refactoring improves the CI/CD workflow structure by:

- Split the monolithic setup-frontend action into two focused actions:
  - setup-frontend: Now only handles frontend dependency installation and building
  - setup-comfyui-server: New action for ComfyUI server setup and launch

- Simplified workflow structure with better separation of concerns:
  - Frontend and server setup are now independent and reusable
  - Each action has clearer responsibilities and inputs
  - Removed duplicate setup code across workflows

- Improved tests-ci.yaml workflow:
  - Uses cache/save and cache/restore for the entire workspace
  - Test jobs now restore cached build instead of rebuilding
  - Reduced redundant setup steps in each test shard
  - Better parallelization with faster test execution

- Updated all locale update workflows to use new action structure
- Made setup-playwright a standalone reusable action

Benefits:
- Faster CI runs by reducing redundant builds
- More maintainable with DRY principle
- Easier to debug individual components
- Better action reusability across workflows

.github/workflows/update-locales.yaml

@@ -16,36 +16,29 @@ jobs:
     steps:
     - name: Checkout repository
       uses: actions/checkout@v5
-    
-    - name: Setup Frontend
+
+    # Setup playwright environment
+    - name: Setup ComfyUI Server
+      uses: ./.github/actions/setup-comfyui-server
+    - name: Setup ComfyUI Frontend
       uses: ./.github/actions/setup-frontend
-    
-    - name: Cache tool outputs
-      uses: actions/cache@v4
-      with:
-        path: |
-          ComfyUI_frontend/.cache
-          ComfyUI_frontend/.cache
-        key: i18n-tools-cache-${{ runner.os }}-${{ hashFiles('ComfyUI_frontend/pnpm-lock.yaml') }}
-        restore-keys: |
-          i18n-tools-cache-${{ runner.os }}-
     - name: Setup Playwright
       uses: ./.github/actions/setup-playwright
+
     - name: Start dev server
       # Run electron dev server as it is a superset of the web dev server
       # We do want electron specific UIs to be translated.
       run: pnpm dev:electron &
-      working-directory: ComfyUI_frontend
+
+    # Update locales, collect new strings and update translations using OpenAI, then commit changes
     - name: Update en.json
       run: pnpm collect-i18n
       env:
         PLAYWRIGHT_TEST_URL: http://localhost:5173
-      working-directory: ComfyUI_frontend
     - name: Update translations
       run: pnpm locale
       env:
         OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}
-      working-directory: ComfyUI_frontend
     - name: Commit updated locales
       run: |
         git config --global user.name 'github-actions'
@@ -59,4 +52,3 @@ jobs:
         git add src/locales/
         git diff --staged --quiet || git commit -m "Update locales [skip ci]"
         git push origin HEAD:${{ github.head_ref }}
-      working-directory: ComfyUI_frontend