style(app/schedule): 달력 애니메이션 속도 및 간격 조정

- 달력 열기/닫기 애니메이션 속도 조정 (200ms → 280ms)
- 날짜 스크롤 애니메이션 속도 조정 (150ms → 220ms)
- 달력 요일-날짜 간격 확대 (12px → 16px)
- 날짜 그리드 세로 간격 및 셀 높이 확대

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/lib/views/schedule/schedule_view.dart

@@ -60,7 +60,7 @@ class _ScheduleViewState extends ConsumerState<ScheduleView>
     _calendarPageController = PageController(initialPage: _initialPage);
     _yearPageController = PageController(initialPage: _initialPage);
     _calendarAnimController = AnimationController(
-      duration: const Duration(milliseconds: 200),
+      duration: const Duration(milliseconds: 280),
       vsync: this,
     );
     _calendarAnimation = CurvedAnimation(
@@ -234,7 +234,7 @@ class _ScheduleViewState extends ConsumerState<ScheduleView>
         (itemWidth / 2);
     _dateScrollController.animateTo(
       targetOffset.clamp(0, _dateScrollController.position.maxScrollExtent),
-      duration: const Duration(milliseconds: 150),
+      duration: const Duration(milliseconds: 220),
       curve: Curves.easeOut,
     );
   }
@@ -1286,7 +1286,7 @@ class _ScheduleViewState extends ConsumerState<ScheduleView>
               );
             }).toList(),
           ),
-          const SizedBox(height: 12),
+          const SizedBox(height: 16),
           // 날짜 그리드 (ExpandablePageView로 높이 자동 조절)
           ExpandablePageView.builder(
             controller: _calendarPageController,
@@ -1370,9 +1370,9 @@ class _ScheduleViewState extends ConsumerState<ScheduleView>
       physics: const NeverScrollableScrollPhysics(),
       gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
         crossAxisCount: 7,
-        mainAxisSpacing: 4,
+        mainAxisSpacing: 6,
         crossAxisSpacing: 4,
-        mainAxisExtent: 46, // Container(36) + SizedBox(6) + 여백(4)
+        mainAxisExtent: 50, // Container(36) + SizedBox(6) + 여백
       ),
       itemCount: allDays.length,
       itemBuilder: (context, index) {