feat(tasks): complete task management system with Kanban, Calendar, notifications

- Add Task model with subtasks, priorities, status transitions, dates, hours
- Add Comment polymorphic model for tasks/issues/projects
- Livewire components: TaskManager (list+filters), TaskForm (modal), TaskDetail, TaskKanban (drag&drop), TaskCalendar (FullCalendar)
- TaskPolicy with permissions (view/create/edit/delete/assign/manage all)
- Notifications: assigned, status change, overdue, comment added
- Daily overdue notification job scheduled
- Dashboard widget unifies IssueTask + Task
- i18n: en/es/fr/ru (393 keys each)
- Routes, navigation, offline sync support
- 101 tests passing, Pint compliant on new files

app/Models/User.php

@@ -13,7 +13,7 @@ use Spatie\Permission\Traits\HasRoles;
 class User extends Authenticatable
 {
     /** @use HasFactory<UserFactory> */
-    use HasFactory, Notifiable, HasRoles, HasApiTokens;
+    use HasApiTokens, HasFactory, HasRoles, Notifiable;
 
     /**
      * The attributes that are mass assignable.
@@ -47,16 +47,17 @@ class User extends Authenticatable
     {
         return [
             'email_verified_at' => 'datetime',
-            'password'          => 'hashed',
-            'valid_from'        => 'date',
-            'valid_until'       => 'date',
+            'password' => 'hashed',
+            'valid_from' => 'date',
+            'valid_until' => 'date',
         ];
     }
 
     public function company()
     {
-        return $this->belongsTo(\App\Models\Company::class);
+        return $this->belongsTo(Company::class);
     }
+
     // Many-to-many with projects
     public function projects()
     {
@@ -68,4 +69,20 @@ class User extends Authenticatable
     {
         return $this->hasMany(ProgressUpdate::class);
     }
+
+    // Tasks
+    public function createdTasks()
+    {
+        return $this->hasMany(Task::class, 'created_by');
+    }
+
+    public function assignedTasks()
+    {
+        return $this->hasMany(Task::class, 'assigned_to');
+    }
+
+    public function completedTasks()
+    {
+        return $this->hasMany(Task::class, 'completed_by');
+    }
 }