refactor: Check for boolean prop type on state prop

Author: Jasenkoo

src/VueDatePicker/components/DatepickerInput.vue

@@ -148,8 +148,8 @@
             dp__input_readonly: !defaultedTextInput.value.enabled,
             dp__input: true,
             dp__input_icon_pad: !props.hideInputIcon,
-            dp__input_valid: Boolean(props.state),
-            dp__input_invalid: props.state === false,
+            dp__input_valid: typeof props.state === 'boolean' ? props.state : false,
+            dp__input_invalid: typeof props.state === 'boolean' ? !props.state : false,
             dp__input_focus: isFocused.value || props.isMenuOpen,
             dp__input_reg: !defaultedTextInput.value.enabled,
             ...(defaultedUI.value.input ?? {}),