refactor file system operations

the most notable improvement is that uploads are now using streams so
they no longer require the entire file to be stored in memory

frontend/components/actions/UploadDialog.vue

@@ -54,7 +54,7 @@ function onFilesChanged(event: Event) {
 
     if (uploadStore.destination == null) {
         uploadStore.destination = warrenStore.current;
-    } else if (currentAndUploadRouteMatch.value) {
+    } else if (!currentAndUploadRouteMatch.value) {
         toast.warning('Upload', {
             description:
                 'The unfinished items belong to a different directory. Remove them before attempting to upload to a different directory.',

frontend/components/actions/UploadListEntry.vue

@@ -24,7 +24,10 @@ function createObjectUrl(file: File): string {
                 { 'p-2': !file.data.type.startsWith('image/') },
             ]"
         >
-            <div v-if="file.status === 'not_uploaded'" class="h-full w-full">
+            <div
+                v-if="file.status === 'not_uploaded'"
+                class="flex h-full w-full items-center justify-center"
+            >
                 <img
                     v-if="file.data.type.startsWith('image/')"
                     :src="createObjectUrl(file.data)"