feat: overhaul TODO.md and enhance Kanban components

- Updated TODO.md to reflect the new project structure and phases, marking several tasks as completed.
- Enhanced Kanban components with a tech-inspired design, including new styles for columns and task cards.
- Removed the obsolete reminders service and task processor, streamlining the codebase for better maintainability.
- Introduced a modern API for task management, including CRUD operations and improved error handling.
- Updated global styles for a cohesive dark theme and added custom scrollbar styles.

src/app/page.tsx

@@ -1,26 +1,23 @@
-import { taskProcessorService } from '@/services/task-processor';
-import { getTargetRemindersList } from '@/lib/config';
+import { tasksService } from '@/services/tasks';
 import { KanbanBoard } from '../../components/kanban/Board';
 import { Header } from '../../components/ui/Header';
 
 export default async function HomePage() {
-  // SSR - Récupération des données côté serveur
+  // SSR - Récupération des données côté serveur (focus sur les tâches récentes)
   const [tasks, stats] = await Promise.all([
-    taskProcessorService.getTasks({ limit: 100 }),
-    taskProcessorService.getTaskStats()
+    tasksService.getTasks({ limit: 20 }), // Réduire pour voir les nouvelles tâches
+    tasksService.getTaskStats()
   ]);
 
-  const targetList = getTargetRemindersList();
-
   return (
-    <div className="min-h-screen bg-gray-50 dark:bg-gray-900">
+    <div className="min-h-screen bg-slate-950">
       <Header 
         title="TowerControl" 
-        subtitle={`Tâches synchronisées depuis "${targetList}"`}
+        subtitle="Gestionnaire de tâches moderne"
         stats={stats}
       />
       
-      <main className="container mx-auto px-4 py-6">
+      <main className="h-[calc(100vh-120px)]">
         <KanbanBoard tasks={tasks} />
       </main>
     </div>