feat: implement drag-and-drop reordering for daily checkboxes

- Added DnD functionality to `DailySection` for reordering checkboxes using `@dnd-kit/core` and `@dnd-kit/sortable`.
- Introduced `onReorderCheckboxes` prop to handle server updates after reordering.
- Updated `useDaily` hook to streamline error handling during reordering.
- Cleaned up `Header` component by removing unnecessary syncing text.
- Adjusted `DailyPageClient` to pass reorder function to `DailySection`.

components/daily/DailyCheckboxSortable.tsx

@@ -0,0 +1,78 @@
+'use client';
+
+import { useSortable } from '@dnd-kit/sortable';
+import { CSS } from '@dnd-kit/utilities';
+import { DailyCheckbox, DailyCheckboxType } from '@/lib/types';
+import { DailyCheckboxItem } from './DailyCheckboxItem';
+
+interface DailyCheckboxSortableProps {
+  checkbox: DailyCheckbox;
+  onToggle: (checkboxId: string) => Promise<void>;
+  onUpdate: (checkboxId: string, text: string, type: DailyCheckboxType, taskId?: string) => Promise<void>;
+  onDelete: (checkboxId: string) => Promise<void>;
+  saving?: boolean;
+}
+
+export function DailyCheckboxSortable({
+  checkbox,
+  onToggle,
+  onUpdate,
+  onDelete,
+  saving = false
+}: DailyCheckboxSortableProps) {
+  const {
+    attributes,
+    listeners,
+    setNodeRef,
+    transform,
+    transition,
+    isDragging,
+  } = useSortable({
+    id: checkbox.id,
+  });
+
+  const style = {
+    transform: CSS.Transform.toString(transform),
+    transition,
+    opacity: isDragging ? 0.5 : 1,
+  };
+
+  return (
+    <div
+      ref={setNodeRef}
+      style={style}
+      className={`
+        ${isDragging ? 'z-50' : 'z-0'}
+        ${isDragging ? 'shadow-lg' : ''}
+        transition-shadow duration-200
+      `}
+    >
+      <div className="relative group">
+        {/* Handle de drag */}
+        <div 
+          {...attributes} 
+          {...listeners}
+          className="absolute left-0 top-0 bottom-0 w-3 cursor-grab active:cursor-grabbing flex items-center justify-center opacity-0 group-hover:opacity-100 transition-opacity"
+          title="Glisser pour réorganiser"
+        >
+          <div className="w-1.5 h-6 flex flex-col justify-center gap-0.5">
+            <div className="w-full h-0.5 bg-[var(--muted-foreground)] rounded"></div>
+            <div className="w-full h-0.5 bg-[var(--muted-foreground)] rounded"></div>
+            <div className="w-full h-0.5 bg-[var(--muted-foreground)] rounded"></div>
+          </div>
+        </div>
+        
+        {/* Checkbox item avec padding left pour le handle */}
+        <div className="pl-4">
+          <DailyCheckboxItem
+            checkbox={checkbox}
+            onToggle={onToggle}
+            onUpdate={onUpdate}
+            onDelete={onDelete}
+            saving={saving}
+          />
+        </div>
+      </div>
+    </div>
+  );
+}

components/daily/DailySection.tsx

@@ -3,8 +3,13 @@
 import { DailyCheckbox, DailyCheckboxType } from '@/lib/types';
 import { Card } from '@/components/ui/Card';
 import { Button } from '@/components/ui/Button';
+import { DailyCheckboxSortable } from './DailyCheckboxSortable';
 import { DailyCheckboxItem } from './DailyCheckboxItem';
 import { DailyAddForm } from './DailyAddForm';
+import { DndContext, closestCenter, DragEndEvent, DragOverlay, DragStartEvent } from '@dnd-kit/core';
+import { SortableContext, verticalListSortingStrategy, arrayMove } from '@dnd-kit/sortable';
+import { useState } from 'react';
+import React from 'react';
 
 interface DailySectionProps {
   title: string;
@@ -14,6 +19,7 @@ interface DailySectionProps {
   onToggleCheckbox: (checkboxId: string) => Promise<void>;
   onUpdateCheckbox: (checkboxId: string, text: string, type: DailyCheckboxType, taskId?: string) => Promise<void>;
   onDeleteCheckbox: (checkboxId: string) => Promise<void>;
+  onReorderCheckboxes: (date: Date, checkboxIds: string[]) => Promise<void>;
   onToggleAll?: () => Promise<void>;
   saving: boolean;
   refreshing?: boolean;
@@ -27,10 +33,13 @@ export function DailySection({
   onToggleCheckbox, 
   onUpdateCheckbox,
   onDeleteCheckbox,
+  onReorderCheckboxes,
   onToggleAll,
   saving,
   refreshing = false
 }: DailySectionProps) {
+  const [activeId, setActiveId] = useState<string | null>(null);
+  const [items, setItems] = useState(checkboxes);
   const formatShortDate = (date: Date) => {
     return date.toLocaleDateString('fr-FR', {
       day: '2-digit',
@@ -39,67 +48,136 @@ export function DailySection({
     });
   };
 
+  // Mettre à jour les items quand les checkboxes changent
+  React.useEffect(() => {
+    setItems(checkboxes);
+  }, [checkboxes]);
+
+  const handleDragStart = (event: DragStartEvent) => {
+    setActiveId(event.active.id as string);
+  };
+
+  const handleDragEnd = async (event: DragEndEvent) => {
+    const { active, over } = event;
+    setActiveId(null);
+
+    if (!over || active.id === over.id) {
+      return;
+    }
+
+    const oldIndex = items.findIndex((item) => item.id === active.id);
+    const newIndex = items.findIndex((item) => item.id === over.id);
+
+    if (oldIndex !== -1 && newIndex !== -1) {
+      // Mise à jour optimiste
+      const newItems = arrayMove(items, oldIndex, newIndex);
+      setItems(newItems);
+
+      // Envoyer l'ordre au serveur
+      const checkboxIds = newItems.map(item => item.id);
+      try {
+        await onReorderCheckboxes(date, checkboxIds);
+      } catch (error) {
+        // Rollback en cas d'erreur
+        setItems(checkboxes);
+        console.error('Erreur lors du réordonnancement:', error);
+      }
+    }
+  };
+
+  const activeCheckbox = activeId ? items.find(item => item.id === activeId) : null;
+
   return (
-    <Card className="p-0 flex flex-col h-[600px]">
-      {/* Header */}
-      <div className="p-4 pb-0">
-        <div className="flex items-center justify-between mb-4">
-          <h2 className="text-lg font-bold text-[var(--foreground)] font-mono flex items-center gap-2">
-            {title} <span className="text-sm font-normal text-[var(--muted-foreground)]">({formatShortDate(date)})</span>
-            {refreshing && (
-              <div className="w-4 h-4 border-2 border-[var(--primary)] border-t-transparent rounded-full animate-spin"></div>
-            )}
-          </h2>
-          <div className="flex items-center gap-2">
-            <span className="text-xs text-[var(--muted-foreground)] font-mono">
-              {checkboxes.filter(cb => cb.isChecked).length}/{checkboxes.length}
-            </span>
-            {onToggleAll && checkboxes.length > 0 && (
-              <Button
-                type="button"
-                onClick={onToggleAll}
-                variant="ghost"
-                size="sm"
-                disabled={saving}
-                className="text-xs px-2 py-1 h-6"
-                title="Tout cocher/décocher"
-              >
-                ✓
-              </Button>
-            )}
+    <DndContext
+      collisionDetection={closestCenter}
+      onDragStart={handleDragStart}
+      onDragEnd={handleDragEnd}
+      id={`daily-dnd-${title.replace(/[^a-zA-Z0-9]/g, '-')}`}
+    >
+      <Card className="p-0 flex flex-col h-[600px]">
+        {/* Header */}
+        <div className="p-4 pb-0">
+          <div className="flex items-center justify-between mb-4">
+            <h2 className="text-lg font-bold text-[var(--foreground)] font-mono flex items-center gap-2">
+              {title} <span className="text-sm font-normal text-[var(--muted-foreground)]">({formatShortDate(date)})</span>
+              {refreshing && (
+                <div className="w-4 h-4 border-2 border-[var(--primary)] border-t-transparent rounded-full animate-spin"></div>
+              )}
+            </h2>
+            <div className="flex items-center gap-2">
+              <span className="text-xs text-[var(--muted-foreground)] font-mono">
+                {checkboxes.filter(cb => cb.isChecked).length}/{checkboxes.length}
+              </span>
+              {onToggleAll && checkboxes.length > 0 && (
+                <Button
+                  type="button"
+                  onClick={onToggleAll}
+                  variant="ghost"
+                  size="sm"
+                  disabled={saving}
+                  className="text-xs px-2 py-1 h-6"
+                  title="Tout cocher/décocher"
+                >
+                  ✓
+                </Button>
+              )}
+            </div>
           </div>
         </div>
-      </div>
 
-      {/* Liste des checkboxes - zone scrollable */}
-      <div className="flex-1 px-4 overflow-y-auto min-h-0">
-        <div className="space-y-1.5 pb-4">
-          {checkboxes.map((checkbox) => (
-            <DailyCheckboxItem
-              key={checkbox.id}
-              checkbox={checkbox}
-              onToggle={onToggleCheckbox}
-              onUpdate={onUpdateCheckbox}
-              onDelete={onDeleteCheckbox}
-              saving={saving}
-            />
-          ))}
+        {/* Liste des checkboxes - zone scrollable avec drag & drop */}
+        <div className="flex-1 px-4 overflow-y-auto min-h-0">
+          <SortableContext items={items.map(item => item.id)} strategy={verticalListSortingStrategy}>
+            <div className="space-y-1.5 pb-4">
+              {items.map((checkbox) => (
+                <DailyCheckboxSortable
+                  key={checkbox.id}
+                  checkbox={checkbox}
+                  onToggle={onToggleCheckbox}
+                  onUpdate={onUpdateCheckbox}
+                  onDelete={onDeleteCheckbox}
+                  saving={saving}
+                />
+              ))}
 
-          {checkboxes.length === 0 && (
-            <div className="text-center py-8 text-[var(--muted-foreground)] text-sm font-mono">
-              Aucune tâche pour cette période
+              {items.length === 0 && (
+                <div className="text-center py-8 text-[var(--muted-foreground)] text-sm font-mono">
+                  Aucune tâche pour cette période
+                </div>
+              )}
             </div>
-          )}
+          </SortableContext>
         </div>
-      </div>
 
-      {/* Footer - Formulaire d'ajout toujours en bas */}
-      <div className="p-4 pt-2 border-t border-[var(--border)]/30 bg-[var(--card)]/50">
-        <DailyAddForm
-          onAdd={onAddCheckbox}
-          disabled={saving}
-        />
-      </div>
-    </Card>
+        {/* Footer - Formulaire d'ajout toujours en bas */}
+        <div className="p-4 pt-2 border-t border-[var(--border)]/30 bg-[var(--card)]/50">
+          <DailyAddForm
+            onAdd={onAddCheckbox}
+            disabled={saving}
+          />
+        </div>
+      </Card>
+
+      <DragOverlay 
+        dropAnimation={null}
+        style={{ 
+          transformOrigin: '0 0',
+        }}
+      >
+        {activeCheckbox ? (
+          <div className="bg-[var(--card)] border border-[var(--border)] rounded-md shadow-xl opacity-95 transform rotate-3 scale-105">
+            <div className="pl-4">
+              <DailyCheckboxItem
+                checkbox={activeCheckbox}
+                onToggle={() => Promise.resolve()}
+                onUpdate={() => Promise.resolve()}
+                onDelete={() => Promise.resolve()}
+                saving={false}
+              />
+            </div>
+          </div>
+        ) : null}
+      </DragOverlay>
+    </DndContext>
   );
 }

components/ui/Header.tsx

@@ -51,7 +51,7 @@ export function Header({ title = "TowerControl", subtitle = "Task Management", s
                   {title}
                 </h1>
                 <p className="text-[var(--muted-foreground)] mt-1 font-mono text-sm">
-                  {subtitle} {syncing && '• Synchronisation...'}
+                  {subtitle}
                 </p>
               </div>
             </div>