ci: deploy Cloudflare Pages on main branch pushes

- Trigger on push to main (production) and PRs (preview)
- Add VITE_CLOUDFLARE_GIT_COMMIT_SHA env var
- branch ref is auto-mapped: main→production, others→preview

Author: shahboura

.github/workflows/cloudflare-pages.yml

@@ -4,7 +4,7 @@ on:
   pull_request:
   push:
     branches:
-      - feat/cloudflare-pages-deploy
+      - main
 
 concurrency:
   group: cloudflare-${{ github.ref }}
@@ -28,6 +28,7 @@ jobs:
       - name: Build the app
         run: pnpm build
         env:
+          VITE_CLOUDFLARE_GIT_COMMIT_SHA: ${{ github.sha }}
           VITE_VERCEL_GIT_COMMIT_SHA: ${{ github.sha }}
 
       - name: Deploy to Cloudflare Pages