fix: implement DOM content updates and reset functionality

- Added DOM re-rendering when changes are accepted to show updated content
- Implemented proper reset functionality using resetToOriginal() method
- Fixed reset button to restore all sections to original state
- Created comprehensive real user functionality tests that validate actual user experience

Features implemented:
- Content changes now immediately visible in DOM after accepting edits
- Reset button properly restores all content and section states
- Event-driven DOM updates maintain synchronization between data and display

Tests added:
- Real user functionality validation (not just API testing)
- Complete editing workflow validation
- Multi-section editing and reset testing
- Cancel operation verification

🤖 Generated with [Claude Code](https://claude.ai/code)

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

markitect/clean_document_manager.py

@@ -1238,7 +1238,16 @@ document.addEventListener('DOMContentLoaded', function() {
         },
         'reset-all': () => {
             console.log('Reset all clicked');
-            // TODO: Implement reset functionality
+            // Hide any open editors
+            domRenderer.hideCurrentEditor();
+            // Reset all sections to original state
+            const allSections = Array.from(sectionManager.sections.values());
+            allSections.forEach(section => {
+                section.resetToOriginal();
+            });
+            // Re-render all sections
+            domRenderer.renderAllSections(allSections);
+            debugPanel.addMessage(`Reset all sections to original state`, 'INFO');
         },
         'show-status': () => {
             const status = sectionManager.getDocumentStatus();
@@ -1260,6 +1269,16 @@ document.addEventListener('DOMContentLoaded', function() {
 
     sectionManager.on('changes-accepted', (data) => {
         debugPanel.addMessage(`Changes accepted for section: ${data.sectionId}`, 'SUCCESS');
+        // Re-render the section to show updated content
+        const section = sectionManager.sections.get(data.sectionId);
+        if (section) {
+            const sectionElement = domRenderer.findSectionElement(data.sectionId);
+            if (sectionElement) {
+                const newElement = domRenderer.renderSection(section);
+                sectionElement.parentNode.replaceChild(newElement, sectionElement);
+                debugPanel.addMessage(`DOM updated for section: ${data.sectionId}`, 'INFO');
+            }
+        }
     });
 
     sectionManager.on('changes-cancelled', (data) => {