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>

src/Models/Ticket.php

@@ -10,7 +10,7 @@ class Ticket extends Model
 {
     protected $fillable = [
         'number', 'group_id', 'submitter_id', 'assigned_to', 'project_id',
-        'title', 'description', 'status', 'priority_id', 'due_date',
+        'title', 'description', 'status', 'priority_id', 'due_date', 'merged_into_id',
     ];
 
     protected $casts = [
@@ -41,4 +41,19 @@ class Ticket extends Model
     {
         return $this->hasMany(TicketAttachment::class, 'ticket_id');
     }
+
+    public function views(): HasMany
+    {
+        return $this->hasMany(TicketView::class, 'ticket_id')->orderBy('viewed_at');
+    }
+
+    public function participants(): HasMany
+    {
+        return $this->hasMany(TicketParticipant::class, 'ticket_id');
+    }
+
+    public function mergedInto(): BelongsTo
+    {
+        return $this->belongsTo(Ticket::class, 'merged_into_id');
+    }
 }