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/TicketView.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace Dashboard\Ticketing\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class TicketView extends Model
+{
+    public $timestamps = false;
+
+    protected $table    = 'ticket_views';
+    protected $fillable = ['ticket_id', 'user_id', 'viewed_at'];
+    protected $casts    = ['viewed_at' => 'datetime'];
+
+    public function ticket(): BelongsTo
+    {
+        return $this->belongsTo(Ticket::class);
+    }
+}