Add batch support for Vitest unit tests and update workflows:

- Introduced `run-vitest-unit-batches.mjs` script for running unit tests in batches with configurable batch size.
- Updated `package.json` to replace `test:unit` command with the batch runner and added `test:unit:single` for direct execution.
- Tweaked GitHub workflows (`tests.yml`, `code_quality.yml`) to use updated actions and support batch testing.
- Minor formatting improvements in Vue components and workflows for consistent style.

.github/workflows/tests.yml

@@ -19,10 +19,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Setup Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v5
         with:
           node-version: 22
           cache: npm
@@ -38,10 +38,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Setup Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v5
         with:
           node-version: 22
           cache: npm
@@ -54,6 +54,8 @@ jobs:
 
       - name: Unit tests
         run: npm run test:unit
+        env:
+          VITEST_BATCH_SIZE: 10
 
   e2e-smoke:
     if: github.event_name != 'schedule'
@@ -65,10 +67,10 @@ jobs:
         project: [chromium-desktop, chromium-mobile]
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Setup Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v5
         with:
           node-version: 22
           cache: npm
@@ -99,10 +101,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Setup Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v5
         with:
           node-version: 22
           cache: npm