feat: Comment edit/delete, auto-link URLs, markdown tables, mobile fixes

- Add comment edit/delete functionality (owner or admin can modify)
- Add edit/delete buttons to comments in TicketView
- Create update_comment.php and delete_comment.php API endpoints
- Add updateComment() and deleteComment() methods to CommentModel
- Show "(edited)" indicator on modified comments
- Add migration script for updated_at column

- Auto-link URLs in plain text comments (non-markdown)
- Add markdown table support with proper HTML rendering
- Preserve code blocks during markdown parsing

- Fix mobile UI elements showing on desktop (add display:none defaults)
- Add mobile styles for CreateTicketView form elements
- Stack status-priority-row on mobile devices

- Update cache busters to v20260124e
- Update Claude.md and README.md documentation

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

index.php

@@ -82,6 +82,14 @@ switch (true) {
         require_once 'api/add_comment.php';
         break;
 
+    case $requestPath == '/api/update_comment.php':
+        require_once 'api/update_comment.php';
+        break;
+
+    case $requestPath == '/api/delete_comment.php':
+        require_once 'api/delete_comment.php';
+        break;
+
     case $requestPath == '/api/ticket_dependencies.php':
         require_once 'api/ticket_dependencies.php';
         break;