refactor: compartilha utilitários e refina widgets e calendário

src/shared/utils/initials.ts

@@ -0,0 +1,15 @@
+/**
+ * Builds a 2-character initials string from a name.
+ * Falls back to the provided `fallback` (default "??") when the name is empty.
+ */
+export function buildInitials(value: string, fallback = "??"): string {
+	const parts = value.trim().split(/\s+/).filter(Boolean);
+	if (parts.length === 0) return fallback;
+	if (parts.length === 1) {
+		const firstPart = parts[0];
+		return firstPart ? firstPart.slice(0, 2).toUpperCase() : fallback;
+	}
+	const firstChar = parts[0]?.[0] ?? "";
+	const secondChar = parts[1]?.[0] ?? "";
+	return `${firstChar}${secondChar}`.toUpperCase() || fallback;
+}