Fix CI/CD pipeline issues from code review FRE-4690

P1: Fix TestFlight deployment — add LendairApp executable target,
    use xcodebuild archive/export instead of swift build for IPA
P2: Fix swift-format — use built-in 'swift format lint' (Swift 5.6+)
    instead of external 'swift-format' binary
P3: Create missing index.html for Vite build entry point
P3: Update vercel-action from v30 to v25 (better maintained)

.github/workflows/web-ci.yml

@@ -99,7 +99,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Deploy to Vercel
-        uses: amondnet/vercel-action@v30
+        uses: amondnet/vercel-action@v25
         with:
           vercel-token: ${{ secrets.VERCEL_TOKEN }}
           vercel-org-id: ${{ secrets.VERCEL_ORG_ID }}