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/custom_events/custom_event_edit_dialog.dart

@@ -281,26 +281,22 @@ class _CustomEventEditDialogState extends State<CustomEventEditDialog> {
             ),
           ),
           const Divider(),
-          RRuleGenerator(
-            config: RRuleGeneratorConfig(
-              selectDayStyle: RRuleSelectDayStyle(
-                dayStyle: BoxDecoration(
-                  shape: BoxShape.circle,
-                  color: Theme.of(context).colorScheme.secondary,
-                ),
-                dayTextStyle: const TextStyle(color: Colors.black),
-                selectedDayStyle: BoxDecoration(
-                  shape: BoxShape.circle,
-                  color: Theme.of(context).primaryColor,
-                ),
-              ),
+          // The RRuleGenerator widget has zero outer padding while every
+          // surrounding ListTile uses the default 16px horizontal indent.
+          // Wrap it to match — keeps the rule editor visually aligned with
+          // the date/time/color rows above instead of hugging the dialog
+          // border.
+          Padding(
+            padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 4),
+            child: RRuleGenerator(
+              config: _rruleConfig(context),
+              initialRRule: _rrule,
+              locale: RRuleLocale.de_DE,
+              onChange: (newValue) {
+                log('Rule: $newValue');
+                setState(() => _rrule = newValue);
+              },
             ),
-            initialRRule: _rrule,
-            locale: RRuleLocale.de_DE,
-            onChange: (newValue) {
-              log('Rule: $newValue');
-              setState(() => _rrule = newValue);
-            },
           ),
         ],
       ),
@@ -312,4 +308,69 @@ class _CustomEventEditDialogState extends State<CustomEventEditDialog> {
       ),
     ],
   );
+
+  /// Maps the rrule_generator widget onto Marianum's Material theme so its
+  /// pickers blend in with the rest of the form (the package's defaults
+  /// have an out-of-place red switch outline and bold ALL-CAPS-feeling
+  /// headers). Layout itself stays as the package provides — fully custom
+  /// styling beyond what `RRuleGeneratorConfig` exposes isn't possible
+  /// without forking it.
+  RRuleGeneratorConfig _rruleConfig(BuildContext context) {
+    final theme = Theme.of(context);
+    final cs = theme.colorScheme;
+    return RRuleGeneratorConfig(
+      headerStyle: RRuleHeaderStyle(
+        textStyle:
+            theme.textTheme.titleSmall?.copyWith(
+              fontWeight: FontWeight.w600,
+              color: cs.onSurface,
+            ) ??
+            const TextStyle(),
+      ),
+      labelStyle:
+          theme.textTheme.bodyMedium?.copyWith(color: cs.onSurfaceVariant) ??
+          const TextStyle(),
+      inputTextStyle: RRuleInputTextStyle(
+        inputTextDecoration: const InputDecoration(
+          isDense: true,
+          border: OutlineInputBorder(),
+        ),
+        inputTextStyle:
+            theme.textTheme.bodyMedium ?? const TextStyle(),
+      ),
+      dropdownStyle: RRuleDropdownStyle(
+        dropdownMenuTextStyle: theme.textTheme.bodyMedium ?? const TextStyle(),
+        dropdownMenuItemTextStyle:
+            theme.textTheme.bodyMedium ?? const TextStyle(),
+      ),
+      switchStyle: RRuleSwitchStyle(
+        thumbColor: cs.onPrimary,
+        activeTrackColor: cs.primary,
+        inactiveTrackColor: cs.surfaceContainerHighest,
+        trackOutlineWidth: 0,
+        trackOutlineColor: Colors.transparent,
+        switchTextStyle:
+            theme.textTheme.bodyMedium?.copyWith(
+              color: cs.onSurface,
+            ) ??
+            const TextStyle(),
+      ),
+      selectDayStyle: RRuleSelectDayStyle(
+        dayStyle: BoxDecoration(
+          shape: BoxShape.circle,
+          color: cs.surfaceContainerHighest,
+        ),
+        dayTextStyle: TextStyle(color: cs.onSurface),
+        selectedDayStyle: BoxDecoration(
+          shape: BoxShape.circle,
+          color: cs.primary,
+        ),
+        selectedDayTextStyle: TextStyle(color: cs.onPrimary),
+      ),
+      datePickerStyle: RRuleDatePickerStyle(
+        datePickerTextStyle: theme.textTheme.bodyMedium ?? const TextStyle(),
+      ),
+      divider: const Divider(height: 1),
+    );
+  }
 }