implemented task.total_prio:

- is dependent on the manually set priority of the task
- increases within 100 days before the due date of a task

frontend/src/routes/project/KanbanCard.svelte

@@ -2,7 +2,7 @@
     let { onclick, ondragstart, task } = $props();
 </script>
 
-<div draggable="true" class={`box prio_${task.priority} p${Math.floor(task.priority/10)*10} p${task.priority % 10}`} {onclick} {ondragstart} >
+<div draggable="true" class={`box prio_${task.total_prio} p${Math.floor(task.total_prio/10)*10} p${task.total_prio % 10}`} {onclick} {ondragstart} >
     <span class="title">{task.name}</span>
     {#if task.estimated_time}
     <span class="estimate">