Restore previous task list view and fix task update issues

Revert client-side task routing to use the previous `TasksListSimple` component and implement server-side data cleaning for task updates, specifically addressing potential issues with `startDate` and `dueDate` when they are empty strings.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: cc2d271b-82f0-4d6a-9302-a0b067ffb429
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/1957c339-2757-4d1f-8e92-e9f71a1ce58e/cc2d271b-82f0-4d6a-9302-a0b067ffb429/fN5Ayh3

client/src/components/RouterProduction.tsx

@@ -19,7 +19,7 @@ import CustomerOrders from "@/pages/CustomerOrders";
 import DlcPage from "@/pages/DlcPage";
 import BackupManager from "@/pages/BackupManager";
 import Utilities from "@/pages/Utilities";
-import TasksProductionSimple from "@/pages/TasksProductionSimple";
+import TasksListSimple from "@/pages/TasksListSimple";
 import SavTickets from "@/pages/SavTickets";
 import WeatherSettings from "@/pages/WeatherSettings";
 import Layout from "@/components/Layout";
@@ -94,7 +94,7 @@ function RouterProduction() {
         <Route path="/customer-orders" component={CustomerOrders} />
         <Route path="/dlc" component={DlcPage} />
         <Route path="/utilities" component={Utilities} />
-        <Route path="/tasks" component={TasksProductionSimple} />
+        <Route path="/tasks" component={TasksListSimple} />
         <Route path="/sav" component={SavTickets} />
         
         {/* Routes de compatibilité - redirection vers utilities */}