feat(ui): enhance file browser drag-and-drop and move functionality

Refactor the file browser to improve the user experience and reliability of
folder management and item movement.

- Implement a dedicated drag handle wrapper to improve drag-and-drop
  precision and visual feedback.
- Improve drag-and-drop event handling to prevent accidental triggers
  and ensure correct visual states during drag operations.
- Refactor the move modal logic and styling for better clarity and
  usability.
- Fix folder menu closing logic to correctly handle outside clicks.
- Update CI workflow to ensure Docker is installed before building
  images.

.github/workflows/docker-images.yml

@@ -28,6 +28,15 @@ jobs:
         id: image
         run: echo "repository=ghcr.io/${GITHUB_REPOSITORY,,}" >> "$GITHUB_OUTPUT"
 
+      - name: Set up Docker
+        run: |
+          if ! command -v docker &> /dev/null; then
+            curl -fsSL https://get.docker.com -o get-docker.sh
+            sudo sh get-docker.sh
+            rm get-docker.sh
+          fi
+          docker --version
+
       - name: Use GitHub token for GHCR
         uses: docker/login-action@v3
         with: