migrate timer logic into own file + start of tests

.github/workflows/vitest.yaml

@@ -0,0 +1,39 @@
+name: 'Vitest Continuous Integration (CI) Tests'
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    permissions:
+      # Required to checkout the code
+      contents: read
+      # Required to put a comment into the pull-request
+      pull-requests: write
+
+    steps:
+      - name: Checkout Feature Branch
+        uses: actions/checkout@v4
+
+      - name: 'Install Node'
+        uses: actions/setup-node@v4
+        with:
+          node-version: '22.x'
+
+      - name: 'Install Dependencies'
+        run: npm install
+
+      - name: 'Vitest Tests'
+        run: npm run test:coverage
+
+      - name: 'Report Coverage'
+        # Set if: always() to also generate the report if tests are failing
+        # Only works if you set `reportOnFailure: true` in your vite config as specified above
+        if: always()
+        uses: davelosert/vitest-coverage-report-action@v2