perf: optimization des rebuilds (ValueNotifier pour calendrier/container_form, Selector pour pages de gestion et mon compte)

em2rp/lib/views/calendar_page.dart

@@ -51,7 +51,7 @@ class _CalendarPageState extends State<CalendarPage> {
   int _searchRequestId = 0;
   bool _isMobileSearchVisible = false;
   bool _isRefreshing = false;
-  double _detailsPaneFraction = 0.35;
+  final ValueNotifier<double> _detailsPaneFraction = ValueNotifier<double>(0.35);
   String? _lastLoadedUserId;
   bool _initialLoadScheduled = false;
 
@@ -207,6 +207,7 @@ class _CalendarPageState extends State<CalendarPage> {
   void dispose() {
     _searchDebounce?.cancel();
     _searchController.dispose();
+    _detailsPaneFraction.dispose();
     super.dispose();
   }
 
@@ -817,12 +818,10 @@ class _CalendarPageState extends State<CalendarPage> {
       child: GestureDetector(
         behavior: HitTestBehavior.opaque,
         onHorizontalDragUpdate: (details) {
-          setState(() {
-            _detailsPaneFraction = _clampDetailsPaneFraction(
-              _detailsPaneFraction - (details.delta.dx / totalWidth),
-              totalWidth,
-            );
-          });
+          _detailsPaneFraction.value = _clampDetailsPaneFraction(
+            _detailsPaneFraction.value - (details.delta.dx / totalWidth),
+            totalWidth,
+          );
         },
         child: SizedBox(
           width: _desktopResizeHandleWidth,
@@ -935,25 +934,30 @@ class _CalendarPageState extends State<CalendarPage> {
     return LayoutBuilder(
       builder: (context, constraints) {
         final totalWidth = constraints.maxWidth;
-        final detailsPaneFraction =
-            _clampDetailsPaneFraction(_detailsPaneFraction, totalWidth);
-        final detailsWidth = totalWidth * detailsPaneFraction;
-        final calendarWidth =
-            totalWidth - _desktopResizeHandleWidth - detailsWidth;
+        return ValueListenableBuilder<double>(
+          valueListenable: _detailsPaneFraction,
+          builder: (context, fraction, child) {
+            final detailsPaneFraction =
+                _clampDetailsPaneFraction(fraction, totalWidth);
+            final detailsWidth = totalWidth * detailsPaneFraction;
+            final calendarWidth =
+                totalWidth - _desktopResizeHandleWidth - detailsWidth;
 
-        return Row(
-          crossAxisAlignment: CrossAxisAlignment.stretch,
-          children: [
-            SizedBox(
-              width: calendarWidth,
-              child: _buildCalendar(filteredEvents),
-            ),
-            _buildDesktopResizeHandle(totalWidth),
-            SizedBox(
-              width: detailsWidth,
-              child: _buildDesktopDetailsPane(filteredEvents),
-            ),
-          ],
+            return Row(
+              crossAxisAlignment: CrossAxisAlignment.stretch,
+              children: [
+                SizedBox(
+                  width: calendarWidth,
+                  child: _buildCalendar(filteredEvents),
+                ),
+                _buildDesktopResizeHandle(totalWidth),
+                SizedBox(
+                  width: detailsWidth,
+                  child: _buildDesktopDetailsPane(filteredEvents),
+                ),
+              ],
+            );
+          },
         );
       },
     );
@@ -1194,7 +1198,7 @@ class _CalendarPageState extends State<CalendarPage> {
                               ),
                             ),
                           if (!hasEvents)
-                            Center(
+                            const Center(
                               child: Text(
                                   'Aucun événement ne démarre à cette date'),
                             ),