phone input: fix set country with empty input

src/lib/PhoneInput.svelte

@@ -187,9 +187,11 @@
 					if (!e.target) return;
 					const input = e.target as HTMLInputElement;
 
+					// Format the input string
 					const formatter = new AsYouType(formatterCountryCode);
 					const formatted = formatter.input(input.value);
 
+					// If the input length is greater than the last value, use formatted text
 					if (input.value.length >= lastRawValue.length) {
 						setTimeout(() => {
 							input.value = formatted;
@@ -197,15 +199,20 @@
 					}
 					lastValue = formatter.getNumber();
 
-					if (formatter.isValid() && formatter.isInternational() && value) {
+					// If we have a valid international number, update the country
+					if (formatter.isValid() && formatter.isInternational()) {
 						const country = formatter.getCountry();
 						if (country) {
 							setCountryByISO(country);
+
+							// If the phone value has been set before, update it with the new value
+							if (value) {
 								setTimeout(() => {
 									if (lastValue) input.value = lastValue.formatNational();
 								}, 1);
 							}
 						}
+					}
 				}}
 				onblur={() => {
 					value = lastValue;