fix: Inline mode showing above overlays (fixes #116)

Author: Jasenkoo

src/Vue3DatePicker/components/DatepickerMenu.vue

@@ -397,8 +397,9 @@
     const dpMenuClass = computed(
         (): DynamicClass => ({
             dp__menu: true,
-            [props.menuClassName]: !!props.menuClassName,
+            dp__menu_index: !props.inline,
             dp__relative: props.inline,
+            [props.menuClassName]: !!props.menuClassName,
         }),
     );
 

src/Vue3DatePicker/style/components/_DatepickerMenu.scss

@@ -7,7 +7,6 @@
   font-size: $dp__font_size;
   user-select: none;
   border: 1px solid var(--dp-menu-border-color);
-  z-index: 99999;
   box-sizing: border-box;
 
   &::after {
@@ -24,13 +23,17 @@
   }
 }
 
+.dp__menu_index {
+  z-index: 99999;
+}
+
 %__dp_menu_readonly_disabled {
   position: absolute;
   top: 0;
   left: 0;
   right: 0;
   bottom: 0;
-  z-index: 99999;
+  z-index: 1;
 }
 
 .dp__menu_disabled {