refactor: date utils and all calls

src/app/daily/DailyPageClient.tsx

@@ -10,7 +10,7 @@ import { DailyCalendar } from '@/components/daily/DailyCalendar';
 import { DailySection } from '@/components/daily/DailySection';
 import { dailyClient } from '@/clients/daily-client';
 import { Header } from '@/components/ui/Header';
-import { getPreviousWorkday } from '@/lib/workday-utils';
+import { getPreviousWorkday, formatDateLong, isToday, generateDateTitle, formatDateShort, isYesterday } from '@/lib/date-utils';
 
 interface DailyPageClientProps {
   initialDailyView?: DailyView;
@@ -112,37 +112,23 @@ export function DailyPageClient({
   };
 
   const formatCurrentDate = () => {
-    return currentDate.toLocaleDateString('fr-FR', {
-      weekday: 'long',
-      year: 'numeric',
-      month: 'long',
-      day: 'numeric'
-    });
+    return formatDateLong(currentDate);
   };
 
-  const isToday = () => {
-    const today = new Date();
-    return currentDate.toDateString() === today.toDateString();
+  const isTodayDate = () => {
+    return isToday(currentDate);
   };
 
   const getTodayTitle = () => {
-    const today = new Date();
-    if (currentDate.toDateString() === today.toDateString()) {
-      return "🎯 Aujourd'hui";
-    }
-    return `🎯 ${currentDate.toLocaleDateString('fr-FR', { day: '2-digit', month: '2-digit', year: '2-digit' })}`;
+    return generateDateTitle(currentDate, '🎯');
   };
 
   const getYesterdayTitle = () => {
-    const today = new Date();
-    const yesterday = new Date(today);
-    yesterday.setDate(yesterday.getDate() - 1);
-    
     const yesterdayDate = getYesterdayDate();
-    if (yesterdayDate.toDateString() === yesterday.toDateString()) {
+    if (isYesterday(yesterdayDate)) {
       return "📋 Hier";
     }
-    return `📋 ${yesterdayDate.toLocaleDateString('fr-FR', { day: '2-digit', month: '2-digit', year: '2-digit' })}`;
+    return `📋 ${formatDateShort(yesterdayDate)}`;
   };
 
   if (loading) {
@@ -198,7 +184,7 @@ export function DailyPageClient({
               <div className="text-sm font-bold text-[var(--foreground)] font-mono">
                 {formatCurrentDate()}
               </div>
-              {!isToday() && (
+              {!isTodayDate() && (
                 <button
                   onClick={goToToday}
                   className="text-xs text-[var(--primary)] hover:text-[var(--primary)]/80 font-mono"