web/queue: add remuxing progress & general improvements

and a bunch of other stuff:
- size and percentage in queue
- indeterminate progress bar
- if libav wasm freezes, the worker kill itself
- cleaner states
- cleaner props

web/src/components/misc/DropReceiver.svelte

@@ -16,7 +16,6 @@
     };
 
     const dragOverHandler = (ev: DragEvent) => {
-        console.log("dragged over omg")
         draggedOver = true;
         ev.preventDefault();
     };