feat(CI): modular testing and linting system + cursor rule

.github/workflows/pr-ci.yml

@@ -1,11 +1,13 @@
-name: PR CI
+name: CI
 
 on:
   pull_request:
     branches: ["main"]
+  push:
+    branches: ["main"]
 
 jobs:
-  ci:
+  lint:
     # windows-latest: Vite/Svelte build fails on Linux CI for layerchart vendor .svelte (see nightly.yml).
     runs-on: windows-latest
     defaults:
@@ -14,21 +16,34 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - name: Use Node.js 22.x
-        uses: actions/setup-node@v4
-        with:
-          node-version: 22.x
+      - name: Setup Node and dependencies
+        uses: ./.github/actions/setup-node-deps
 
-      - name: Install dependencies
-        run: npm install --legacy-peer-deps
+      - name: Run lint
+        uses: ./.github/actions/run-lint
 
-      - name: Lint
-        run: npm run lint
-        env:
-          ESLINT_USE_FLAT_CONFIG: "false"
+  unit-tests:
+    runs-on: windows-latest
+    defaults:
+      run:
+        shell: bash
+    steps:
+      - uses: actions/checkout@v4
 
-      - name: Unit tests
-        run: npm test
+      - name: Setup Node and dependencies
+        uses: ./.github/actions/setup-node-deps
+
+      - name: Run unit tests
+        uses: ./.github/actions/run-unit-tests
+
+  build-and-smoke:
+    needs: [lint, unit-tests]
+    runs-on: windows-latest
+    defaults:
+      run:
+        shell: bash
+    steps:
+      - uses: actions/checkout@v4
 
       - name: Build extension
         id: build
@@ -44,5 +59,5 @@ jobs:
             ${{ steps.build.outputs.chrome_zip }}
             ${{ steps.build.outputs.firefox_zip }}
 
-      - name: Smoke tests
-        run: npm run test:smoke
+      - name: Run smoke tests
+        uses: ./.github/actions/run-smoke-tests