feat: refactor ObjectivesBoard and enhance column visibility management

- Replaced local state management in `ObjectivesBoard` with `useObjectivesCollapse` hook for better state handling.
- Updated collapse button logic to use the new hook's toggle function, improving code clarity.
- Refactored `useColumnVisibility` to load user preferences on mount and persist visibility changes, enhancing user experience.
- Integrated user preferences for Kanban filters in `TasksContext`, allowing for persistent filter settings across sessions.

components/kanban/ObjectivesBoard.tsx

@@ -1,6 +1,6 @@
 'use client';
 
-import { useState } from 'react';
+import { useObjectivesCollapse } from '@/hooks/useObjectivesCollapse';
 import { Task } from '@/lib/types';
 import { TaskCard } from './TaskCard';
 import { Card, CardHeader, CardContent } from '@/components/ui/Card';
@@ -23,7 +23,7 @@ export function ObjectivesBoard({
   compactView = false,
   pinnedTagName = "Objectifs"
 }: ObjectivesBoardProps) {
-  const [isCollapsed, setIsCollapsed] = useState(false);
+  const { isCollapsed, toggleCollapse } = useObjectivesCollapse();
   
   if (tasks.length === 0) {
     return null; // Ne rien afficher s'il n'y a pas d'objectifs
@@ -36,7 +36,7 @@ export function ObjectivesBoard({
           <CardHeader className="pb-3">
             <div className="flex items-center justify-between">
               <button
-                onClick={() => setIsCollapsed(!isCollapsed)}
+                onClick={toggleCollapse}
                 className="flex items-center gap-3 hover:bg-purple-900/20 rounded-lg p-2 -m-2 transition-colors group"
               >
                 <div className="w-3 h-3 bg-purple-400 rounded-full animate-pulse shadow-purple-400/50 shadow-lg"></div>
@@ -69,7 +69,7 @@ export function ObjectivesBoard({
                 
                 {/* Bouton collapse séparé pour mobile */}
                 <button
-                  onClick={() => setIsCollapsed(!isCollapsed)}
+                  onClick={toggleCollapse}
                   className="lg:hidden p-1 hover:bg-purple-900/20 rounded transition-colors"
                   aria-label={isCollapsed ? "Développer" : "Réduire"}
                 >