fix: sync package-lock.json and add Docker layer cache to CI

- Regenerate desktop/package-lock.json to match package.json (npm ci was failing due to out-of-sync lockfile)
- Add cache-from/cache-to to Docker build steps to reuse layers from the registry (akoflow/akoflow:latest)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: ovvesley

.github/workflows/ci-cd.yml

@@ -53,6 +53,8 @@ jobs:
           platforms: linux/amd64,linux/arm64
           tags: |
             ${{ env.IMAGE }}:latest
+          cache-from: type=registry,ref=${{ env.IMAGE }}:latest
+          cache-to: type=inline
 
       - name: Build & push image (version tag)
         if: startsWith(github.ref, 'refs/tags/')
@@ -65,6 +67,8 @@ jobs:
           tags: |
             ${{ env.IMAGE }}:latest
             ${{ env.IMAGE }}:${{ github.ref_name }}
+          cache-from: type=registry,ref=${{ env.IMAGE }}:latest
+          cache-to: type=inline
 
   # ─────────────────────────────────────────────
   # Desktop – macOS