fix(formatDate): prevent sequential replacements from corrupting month/weekday names

Use placeholder tokens to protect text values (month names, weekday names,
ordinals, AM/PM) during the replacement chain. Letters like 'h' in "March"
were being replaced by hour values, producing incorrect output like "Marc10".

Author: chhoumann

src/utility/formatDate.ts

@@ -43,17 +43,26 @@ export function formatDate(date: Date, format: string): string {
     const hours12 = hours % 12 || 12;
     const isPM = hours >= 12;
 
+    // Use placeholders for text values to prevent later replacements from corrupting them
+    // (e.g., "March" contains "h" which would be replaced by hour values)
+    const placeholders: string[] = [];
+    const addPlaceholder = (value: string): string => {
+        const index = placeholders.length;
+        placeholders.push(value);
+        return `\x00${index}\x00`;
+    };
+
     // Order matters: longer tokens must be replaced before shorter ones
-    return format
+    let result = format
         .replace(/YYYY/g, year.toString())
         .replace(/YY/g, year.toString().slice(-2))
-        .replace(/MMMM/g, monthNames[month])
-        .replace(/MMM/g, monthNamesShort[month])
+        .replace(/MMMM/g, addPlaceholder(monthNames[month]))
+        .replace(/MMM/g, addPlaceholder(monthNamesShort[month]))
         .replace(/MM/g, pad(month + 1))
         .replace(/M/g, (month + 1).toString())
-        .replace(/dddd/g, weekdayNames[weekday])
-        .replace(/ddd/g, weekdayNamesShort[weekday])
-        .replace(/Do/g, ordinal(day))
+        .replace(/dddd/g, addPlaceholder(weekdayNames[weekday]))
+        .replace(/ddd/g, addPlaceholder(weekdayNamesShort[weekday]))
+        .replace(/Do/g, addPlaceholder(ordinal(day)))
         .replace(/DD/g, pad(day))
         .replace(/D/g, day.toString())
         .replace(/HH/g, pad(hours))
@@ -64,6 +73,9 @@ export function formatDate(date: Date, format: string): string {
         .replace(/m/g, minutes.toString())
         .replace(/ss/g, pad(seconds))
         .replace(/s/g, seconds.toString())
-        .replace(/A/g, isPM ? 'PM' : 'AM')
-        .replace(/a/g, isPM ? 'pm' : 'am');
+        .replace(/A/g, addPlaceholder(isPM ? 'PM' : 'AM'))
+        .replace(/a/g, addPlaceholder(isPM ? 'pm' : 'am'));
+
+    // Restore placeholders with actual text values
+    return result.replace(/\x00(\d+)\x00/g, (_, index) => placeholders[parseInt(index, 10)]);
 }