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/Http/Middleware/SetLocale.php

@@ -16,11 +16,12 @@ class SetLocale
     public function handle(Request $request, Closure $next)
     {
         $locale = null;
+        $allowedLocales = ['en', 'es', 'fr', 'ru'];
 
         // 1. From authenticated user preference
         if (Auth::check()) {
             $userLocale = Auth::user()->locale;
-            if ($userLocale && in_array($userLocale, ['en', 'es'])) {
+            if ($userLocale && in_array($userLocale, $allowedLocales)) {
                 $locale = $userLocale;
             }
         }
@@ -28,7 +29,7 @@ class SetLocale
         // 2. From session
         if (!$locale && Session::has('locale')) {
             $sessionLocale = Session::get('locale');
-            if (in_array($sessionLocale, ['en', 'es'])) {
+            if (in_array($sessionLocale, $allowedLocales)) {
                 $locale = $sessionLocale;
             }
         }
@@ -36,14 +37,14 @@ class SetLocale
         // 3. From browser Accept-Language
         if (!$locale) {
             $browserLang = substr($request->server('HTTP_ACCEPT_LANGUAGE', 'en'), 0, 2);
-            if (in_array($browserLang, ['en', 'es'])) {
+            if (in_array($browserLang, $allowedLocales)) {
                 $locale = $browserLang;
             }
         }
 
         // 4. Default to app locale
         if (!$locale) {
-            $locale = config('app.locale', 'es');
+            $locale = config('app.locale', 'en');
         }
 
         App::setLocale($locale);