Release v0.2.2 - Display file checksums in UI

Features:
- Add SHA256 column to admin product versions table
- Display file hash in customer account downloads section
- Style checksum file upload field consistently with package upload

Changes:
- Admin versions table shows truncated hash with full hash on hover
- Customer downloads show hash with shield icon indicator
- Updated German translations

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

templates/frontend/licenses.html.twig

@@ -64,6 +64,12 @@
                                     </a>
                                     <span class="download-version">v{{ esc_html(download.version) }}</span>
                                     <span class="download-date">{{ esc_html(download.released_at) }}</span>
+                                    {% if download.file_hash %}
+                                        <span class="download-hash" title="{{ esc_attr(download.file_hash) }}">
+                                            <span class="dashicons dashicons-shield"></span>
+                                            <code>{{ download.file_hash[:12] }}...</code>
+                                        </span>
+                                    {% endif %}
                                 </li>
                             {% endfor %}
                         </ul>