Fix GitHub Actions workflow to use yarn instead of npm ci

Co-authored-by: 0xrinegade <[email protected]>

Author: Copilot

.github/workflows/comprehensive-e2e-tests.yml

@@ -42,10 +42,10 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: '18'
-          cache: 'npm'
+          cache: 'yarn'
 
       - name: Install dependencies
-        run: npm ci
+        run: yarn install --frozen-lockfile
 
       - name: Install Playwright browsers
         run: npx playwright install --with-deps ${{ matrix.browser }}
@@ -129,10 +129,10 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: '18'
-          cache: 'npm'
+          cache: 'yarn'
 
       - name: Install dependencies
-        run: npm ci
+        run: yarn install --frozen-lockfile
 
       - name: Install Playwright browsers
         run: npx playwright install --with-deps chromium
@@ -190,10 +190,10 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: '18'
-          cache: 'npm'
+          cache: 'yarn'
 
       - name: Install dependencies
-        run: npm ci
+        run: yarn install --frozen-lockfile
 
       - name: Install Playwright browsers
         run: npx playwright install --with-deps chromium webkit
@@ -231,10 +231,10 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: '18'
-          cache: 'npm'
+          cache: 'yarn'
 
       - name: Install dependencies
-        run: npm ci
+        run: yarn install --frozen-lockfile
 
       - name: Install Playwright browsers
         run: npx playwright install --with-deps chromium