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

resources/views/livewire/layout/navigation.blade.php

@@ -49,6 +49,14 @@ new class extends Component
                     </x-nav-link>
                 </div>
 
+                @can('view tasks')
+                <div class="hidden space-x-8 sm:-my-px sm:ms-10 sm:flex">
+                    <x-nav-link :href="route('projects.list')" :active="request()->routeIs('projects.tasks*')" wire:navigate>
+                        {{ __('Tasks') }}
+                    </x-nav-link>
+                </div>
+                @endcan
+
                 @can('view users')
                     <div class="hidden space-x-8 sm:-my-px sm:ms-10 sm:flex">
                         <x-nav-link :href="route('admin.users')" :active="request()->routeIs('admin.users')" wire:navigate>