Replace npm ci with yarn install in comprehensive E2E testing workflow

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

Author: Copilot

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

@@ -58,10 +58,10 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: '20'
-          cache: 'npm'
+          cache: 'yarn'
 
       - name: Install dependencies
-        run: npm ci --legacy-peer-deps
+        run: yarn install --frozen-lockfile
 
       - name: Install Playwright browsers
         run: npx playwright install ${{ matrix.browser }} --with-deps
@@ -111,10 +111,10 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: '20'
-          cache: 'npm'
+          cache: 'yarn'
 
       - name: Install dependencies
-        run: npm ci --legacy-peer-deps
+        run: yarn install --frozen-lockfile
 
       - name: Install Playwright
         run: npx playwright install chromium --with-deps
@@ -156,10 +156,10 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: '20'
-          cache: 'npm'
+          cache: 'yarn'
 
       - name: Install dependencies
-        run: npm ci --legacy-peer-deps
+        run: yarn install --frozen-lockfile
 
       - name: Install Playwright
         run: npx playwright install chromium --with-deps
@@ -210,10 +210,10 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: '20'
-          cache: 'npm'
+          cache: 'yarn'
 
       - name: Install dependencies
-        run: npm ci --legacy-peer-deps
+        run: yarn install --frozen-lockfile
 
       - name: Install Playwright
         run: npx playwright install chromium --with-deps
@@ -254,10 +254,10 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: '20'
-          cache: 'npm'
+          cache: 'yarn'
 
       - name: Install dependencies
-        run: npm ci --legacy-peer-deps
+        run: yarn install --frozen-lockfile
 
       - name: Install Playwright and accessibility tools
         run: |
@@ -304,10 +304,10 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: '20'
-          cache: 'npm'
+          cache: 'yarn'
 
       - name: Install dependencies
-        run: npm ci --legacy-peer-deps
+        run: yarn install --frozen-lockfile
 
       - name: Install Playwright browsers
         run: npx playwright install ${{ matrix.browser }} --with-deps
@@ -426,10 +426,10 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: '20'
-          cache: 'npm'
+          cache: 'yarn'
 
       - name: Install dependencies
-        run: npm ci --legacy-peer-deps
+        run: yarn install --frozen-lockfile
 
       - name: Install Playwright
         run: npx playwright install chromium --with-deps