Stage 3 — WO photos + ETA + QR + public tracking page

- HasMedia (Spatie) on WorkOrder with `photos` collection
- eta_at + tracking_token columns; token auto-generated on create
- Public /t/{token} page — tenant-scoped via subdomain, white-label themed
- QR code SVG via chillerlan/php-qrcode (inline modal + download)
- Filament: SpatieMediaLibraryFileUpload + ETA picker + tracking section
- EditWorkOrder header action "Link client (QR)" modal
- Fix: Auditable::dontSubmitEmptyLogs() → dontLogEmptyChanges() (removed in activitylog)
- Tests: TrackingPageTest (4 pass) covering token gen + cross-tenant isolation

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app/Models/Tenant/WorkOrder.php

@@ -8,10 +8,12 @@ use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\Relations\HasMany;
 use Illuminate\Database\Eloquent\SoftDeletes;
+use Spatie\MediaLibrary\HasMedia;
+use Spatie\MediaLibrary\InteractsWithMedia;
 
-class WorkOrder extends Model
+class WorkOrder extends Model implements HasMedia
 {
-    use Auditable, BelongsToTenant, SoftDeletes;
+    use Auditable, BelongsToTenant, InteractsWithMedia, SoftDeletes;
 
     public const STATUSES = [
         'new' => 'Nou',
@@ -38,17 +40,29 @@ class WorkOrder extends Model
         'complaint', 'diagnosis', 'recommendations',
         'status', 'pay_status', 'approved', 'approved_at',
         'discount_pct', 'total',
+        'eta_at', 'tracking_token',
     ];
 
     protected $casts = [
         'opened_at' => 'date',
         'closed_at' => 'date',
         'approved_at' => 'datetime',
+        'eta_at' => 'datetime',
         'approved' => 'boolean',
         'discount_pct' => 'decimal:2',
         'total' => 'decimal:2',
     ];
 
+    public function registerMediaCollections(): void
+    {
+        $this->addMediaCollection('photos');
+    }
+
+    public function trackingUrl(): string
+    {
+        return url('/t/' . $this->tracking_token);
+    }
+
     public function client(): BelongsTo
     {
         return $this->belongsTo(Client::class);
@@ -112,6 +126,12 @@ class WorkOrder extends Model
     /** Auto-send 'ready' email + broadcast WS event on status change. */
     protected static function booted(): void
     {
+        static::creating(function (self $wo) {
+            if (empty($wo->tracking_token)) {
+                $wo->tracking_token = \Illuminate\Support\Str::random(24);
+            }
+        });
+
         static::updated(function (self $wo) {
             if (
                 $wo->wasChanged('status')