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

lang/en.json

@@ -106,6 +106,8 @@
     "Language": "Language",
     "English": "English",
     "Spanish": "Spanish",
+    "French": "French",
+    "Russian": "Russian",
     "Select language": "Select language",
     "Notifications": "Notifications",
     "Permissions": "Permissions",
@@ -395,5 +397,34 @@
     "My Projects": "My Projects",
     "Editable": "Editable",
     "Name of responsible": "Name of responsible",
-    "Select template...": "Select template..."
+    "Select template...": "Select template...",
+    "Tasks": "Tasks",
+    "Task": "Task",
+    "New Task": "New Task",
+    "Create Task": "Create Task",
+    "Edit Task": "Edit Task",
+    "Delete Task": "Delete Task",
+    "Task title": "Task title",
+    "Task description": "Task description",
+    "Due date": "Due date",
+    "Start date": "Start date",
+    "Estimated hours": "Estimated hours",
+    "Actual hours": "Actual hours",
+    "Assigned to": "Assigned to",
+    "Parent task": "Parent task",
+    "Subtasks": "Subtasks",
+    "No subtasks": "No subtasks",
+    "Add subtask": "Add subtask",
+    "Comments": "Comments",
+    "Add comment": "Add comment",
+    "Write a comment...": "Write a comment...",
+    "No comments yet": "No comments yet",
+    "Task created": "Task created",
+    "Task updated": "Task updated",
+    "Task deleted": "Task deleted",
+    "Status changed": "Status changed",
+    "Overdue": "Overdue",
+    "Due today": "Due today",
+    "Progress": "Progress",
+    "Order": "Order"
 }