Add avatar functionality to User model

- Implemented HasAvatar contract in User model to support avatar management.
- Added getFilamentAvatarUrl method to return the default avatar URL.

app/Models/User.php

@@ -6,6 +6,7 @@ use App\Modules\UserAdjustments\Traits\UserAdjustments;
 use Filament\Models\Contracts\FilamentUser;
 use Filament\Panel;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Filament\Models\Contracts\HasAvatar;
 use Illuminate\Foundation\Auth\User as Authenticatable;
 use Illuminate\Notifications\Notifiable;
 use Illuminate\Support\Facades\Date;
@@ -20,7 +21,7 @@ use Illuminate\Support\Facades\Date;
  * @property Date|null $created_at
  * @property Date|null $updated_at
  */
-class User extends Authenticatable implements FilamentUser
+class User extends Authenticatable implements FilamentUser, HasAvatar
 {
     /** @use HasFactory<\Database\Factories\UserFactory> */
     use HasFactory;
@@ -56,4 +57,12 @@ class User extends Authenticatable implements FilamentUser
     {
         return true;
     }
+
+    /**
+     * Get the avatar URL for the user.
+     */
+    public function getFilamentAvatarUrl(): ?string
+    {
+        return '/assets/images/avatar.png';
+    }
 }