implemented recurrence exception (EXDATE) support for custom events, refactored timetable break and holiday generation logic, and refined RRule editor UI/theming and tile layouts

lib/view/pages/timetable/widgets/appointment_tile.dart

@@ -106,11 +106,10 @@ class _TileContent extends StatelessWidget {
 
         if (isCustom) {
           if (description.isEmpty || bodyLineCapacity <= 0) {
-            return Column(
-              crossAxisAlignment: CrossAxisAlignment.stretch,
-              mainAxisSize: MainAxisSize.min,
-              children: [titleWidget],
-            );
+            // Explicit height + FittedBox in the title keeps a too-tall
+            // intrinsic title (full font size > min-font-line-height) from
+            // overflowing the tile by a couple of pixels.
+            return SizedBox(height: titleLineHeight, child: titleWidget);
           }
           return Column(
             crossAxisAlignment: CrossAxisAlignment.stretch,