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>

README.md

@@ -31,8 +31,10 @@ A feature-rich PHP-based ticketing system designed for tracking and managing dat
 - **Comment Requirements**: Optional comment requirements for specific transitions
 
 ### Collaboration Features
-- **Markdown Comments**: Full Markdown support with live preview and toolbar
+- **Markdown Comments**: Full Markdown support with live preview, toolbar, and table rendering
 - **@Mentions**: Tag users in comments with autocomplete
+- **Comment Edit/Delete**: Comment owners and admins can edit or delete comments
+- **Auto-linking**: URLs in comments are automatically converted to clickable links
 - **File Attachments**: Upload files to tickets with drag-and-drop support
 - **Ticket Dependencies**: Link tickets as blocks/blocked-by/relates-to/duplicates
 - **Activity Timeline**: Complete audit trail of all ticket changes