Overflow and mrpack fixes, comfortable memory slider and more. (#762)

* Add overflow rules for certain elements.

* Round scrollbar corners to be more attractive.

* Avoid corners in avatar & fix white corner in logs

* Increase step to 64 for memory related inputs.

* Fix overflow on title in mod browse. Fixes #740

* Fix overflow in instance mod browsing.

* Add checks for instances without versions.

theseus_gui/src/components/ui/Instance.vue

@@ -187,7 +187,7 @@ onUnmounted(() => unlisten())
   <div class="instance">
     <Card class="instance-card-item button-base" @click="seeInstance" @mouseenter="checkProcess">
       <Avatar
-        size="sm"
+        size="lg"
         :src="
           props.instance.metadata
             ? !props.instance.metadata.icon ||