fix: bump annotation-viewer.js cache buster to v4

Browser was serving stale cached version without editor format
support (objects array). Bumped ?v=4 on all three templates:
recipe_preview, task_execute, task_editor.

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

client/templates/maker/task_editor.html

@@ -1075,7 +1075,7 @@
 {% block extra_js %}
 <script src="https://cdnjs.cloudflare.com/ajax/libs/pdf.js/3.11.174/pdf.min.js"></script>
 <script>if(typeof pdfjsLib!=='undefined')pdfjsLib.GlobalWorkerOptions.workerSrc='https://cdnjs.cloudflare.com/ajax/libs/pdf.js/3.11.174/pdf.worker.min.js';</script>
-<script src="{{ url_for('static', filename='js/annotation-viewer.js') }}?v=3"></script>
+<script src="{{ url_for('static', filename='js/annotation-viewer.js') }}?v=4"></script>
 <script>
 function taskEditor() {
   return {