fix(meetings): improve type safety in weekly day change handler

- Update onWeeklyDayChange method to accept Event instead of boolean
- Remove need for $any() type casting in template
- Add validation for parseInt conversion to prevent NaN values
- Use Number() with isNaN checks to filter invalid weekly_days strings
- Prevent accessing undefined array indices from malformed data

LFXV2-483

Generated with [Claude Code](https://claude.ai/code)

Signed-off-by: Asitha de Silva <asithade@gmail.com>

Author: asithade

apps/lfx-pcc/src/app/modules/project/meetings/components/meeting-recurrence-pattern/meeting-recurrence-pattern.component.html

@@ -53,7 +53,7 @@ <h4 class="text-base font-medium text-gray-900 mb-4">2. Pattern Details</h4>
                 [class.bg-blue-50]="isWeeklyDaySelected(i)"
                 [class.border-blue-300]="isWeeklyDaySelected(i)"
                 [attr.data-testid]="'recurrence-day-' + day.label.toLowerCase()">
-                <input type="checkbox" [checked]="isWeeklyDaySelected(i)" (change)="onWeeklyDayChange(i, $any($event.target).checked)" class="sr-only" />
+                <input type="checkbox" [checked]="isWeeklyDaySelected(i)" (change)="onWeeklyDayChange(i, $event)" class="sr-only" />
                 <span class="text-xs font-medium text-gray-700">{{ day.label }}</span>
               </label>
             }

apps/lfx-pcc/src/app/modules/project/meetings/components/meeting-recurrence-pattern/meeting-recurrence-pattern.component.ts

@@ -62,7 +62,9 @@ export class MeetingRecurrencePatternComponent implements OnInit {
   // Pattern type change handlers
 
   // Weekly days handlers
-  public onWeeklyDayChange(dayIndex: number, checked: boolean): void {
+  public onWeeklyDayChange(dayIndex: number, event: Event): void {
+    const checkbox = event.target as HTMLInputElement;
+    const checked = checkbox.checked;
     const currentDays = this.weeklyDaysArray();
     let newDays: number[];
 
@@ -262,7 +264,13 @@ export class MeetingRecurrencePatternComponent implements OnInit {
 
     // Update weeklyDaysArray signal
     if (recurrenceValue.weekly_days) {
-      const daysArray = recurrenceValue.weekly_days.split(',').map((d: string) => parseInt(d.trim()) - 1);
+      const daysArray = recurrenceValue.weekly_days
+        .split(',')
+        .map((d: string) => {
+          const num = Number(d.trim());
+          return isNaN(num) ? null : num - 1;
+        })
+        .filter((d: number | null): d is number => d !== null);
       this.weeklyDaysArray.set(daysArray);
     } else {
       this.weeklyDaysArray.set([]);
@@ -295,7 +303,13 @@ export class MeetingRecurrencePatternComponent implements OnInit {
     const recurrenceForm = this.recurrenceForm();
     if (!recurrenceForm || !currentValue.weekly_days) return;
 
-    const currentDays = currentValue.weekly_days.split(',').map((d: string) => parseInt(d.trim()));
+    const currentDays = currentValue.weekly_days
+      .split(',')
+      .map((d: string) => {
+        const num = Number(d.trim());
+        return isNaN(num) ? null : num;
+      })
+      .filter((d: number | null): d is number => d !== null);
 
     // If only one day is selected, update it to the new day
     if (currentDays.length === 1) {