feat: ticket views, statuses, participants, merge; mobile layout fixes (#5)

- New migrations: ticket views, statuses, participants, merge support
- New models: TicketView, TicketStatus, TicketParticipant
- New seeder: EmailTemplatesSeeder
- Console commands for ticketing
- Mobile: sidebar min-w-0/overflow-hidden, tab nav overflow-x-auto

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

composer.json

@@ -34,6 +34,9 @@
                 { "key": "ticketing.create",   "label": "Create Tickets",   "description": "Create tickets on behalf of other users"       },
                 { "key": "ticketing.manage",   "label": "Manage Tickets",   "description": "View, assign, and resolve all tickets"         },
                 { "key": "ticketing.settings", "label": "Manage Settings",  "description": "Configure groups, priorities, and integrations" }
+            ],
+            "seeders": [
+                "Dashboard\\Ticketing\\Database\\Seeders\\EmailTemplatesSeeder"
             ]
         }
     }