improve: Implement CodeRabbit AI suggestions for better CI reliability

- Add Chrome setup step using browser-actions/setup-chrome@v1
- Simplify Lighthouse CI command to use existing lighthouserc.js config
- Update lighthouserc.js to use warn-level assertions with realistic thresholds
- Remove long CLI flags in favor of maintainable config file approach
- Ensures Chrome availability and prevents flaky CI failures

Author: Deepak Pandey

.github/workflows/ci-cd.yml

@@ -587,10 +587,13 @@ jobs:
       - name: Install dependencies
         run: npm ci
 
+      - name: Setup Chrome
+        uses: browser-actions/setup-chrome@v1
+
       - name: Run Lighthouse CI
         run: |
           npm install -g @lhci/cli@0.12.x
-          lhci autorun --assert.assertions.categories:performance=warn --assert.assertions.categories:accessibility=warn --assert.assertions.categories:best-practices=warn --assert.assertions.categories:seo=warn --assert.assertions.first-contentful-paint=warn --assert.assertions.largest-contentful-paint=warn --assert.assertions.cumulative-layout-shift=warn --assert.assertions.total-blocking-time=warn --assert.assertions.speed-index=warn
+          lhci autorun
         env:
           LHCI_GITHUB_APP_TOKEN: ${{ secrets.LHCI_GITHUB_APP_TOKEN }}
           LHCI_TOKEN: ${{ secrets.LHCI_TOKEN }}

lighthouserc.js

@@ -20,15 +20,15 @@ module.exports = {
     },
     assert: {
       assertions: {
-        'categories:performance': ['error', { minScore: 0.8 }],
-        'categories:accessibility': ['error', { minScore: 0.9 }],
-        'categories:best-practices': ['error', { minScore: 0.9 }],
-        'categories:seo': ['error', { minScore: 0.9 }],
-        'first-contentful-paint': ['error', { maxNumericValue: 2000 }],
-        'largest-contentful-paint': ['error', { maxNumericValue: 2500 }],
-        'cumulative-layout-shift': ['error', { maxNumericValue: 0.1 }],
-        'total-blocking-time': ['error', { maxNumericValue: 300 }],
-        'speed-index': ['error', { maxNumericValue: 3000 }]
+        'categories:performance': ['warn', { minScore: 0.6 }],
+        'categories:accessibility': ['warn', { minScore: 0.85 }],
+        'categories:best-practices': ['warn', { minScore: 0.85 }],
+        'categories:seo': ['warn', { minScore: 0.8 }],
+        'first-contentful-paint': ['warn', { maxNumericValue: 3000 }],
+        'largest-contentful-paint': ['warn', { maxNumericValue: 4000 }],
+        'cumulative-layout-shift': ['warn', { maxNumericValue: 0.15 }],
+        'total-blocking-time': ['warn', { maxNumericValue: 1000 }],
+        'speed-index': ['warn', { maxNumericValue: 5000 }]
       }
     },
     upload: {