Add Activity Timeline feature and database migrations

- Add Activity Timeline tab to ticket view showing chronological history
- Create getTicketTimeline() method in AuditLogModel
- Update TicketController to load timeline data
- Add timeline UI with helper functions for formatting events
- Add comprehensive timeline CSS with dark mode support
- Create migrations 007-010 for upcoming features:
  - 007: Ticket assignment functionality
  - 008: Status workflow transitions
  - 009: Ticket templates
  - 010: Bulk operations tracking

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

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

controllers/TicketController.php

@@ -2,15 +2,18 @@
 // Use absolute paths for model includes
 require_once dirname(__DIR__) . '/models/TicketModel.php';
 require_once dirname(__DIR__) . '/models/CommentModel.php';
+require_once dirname(__DIR__) . '/models/AuditLogModel.php';
 
 class TicketController {
     private $ticketModel;
     private $commentModel;
+    private $auditLogModel;
     private $envVars;
     
     public function __construct($conn) {
         $this->ticketModel = new TicketModel($conn);
         $this->commentModel = new CommentModel($conn);
+        $this->auditLogModel = new AuditLogModel($conn);
         
         // Load environment variables for Discord webhook
         $envPath = dirname(__DIR__) . '/.env';
@@ -55,6 +58,9 @@ class TicketController {
         // Get comments for this ticket using CommentModel
         $comments = $this->commentModel->getCommentsByTicketId($id);
 
+        // Get timeline for this ticket
+        $timeline = $this->auditLogModel->getTicketTimeline($id);
+
         // Load the view
         include dirname(__DIR__) . '/views/TicketView.php';
     }