Implement "Destroy all data" button

Which resets the storage manager, not the entire localstorage. Not that localstorage should be touched outside of the storage manager, but it means I can keep my backups for debugging in there.

static/config.mts

@@ -17,6 +17,7 @@ const detailsDialog = findDialogOrFail(document.body, "#instanceDetails");
 const instanceList = findOlOrFail(document.body, "#instanceList");
 const saveButton = findButtonOrFail(document.body, "#save");
 const reorderButton = findButtonOrFail(document.body, "#reorder");
+const resetButton = findButtonOrFail(document.body, "#reset");
 
 let instanceDetailsDialog = new InstanceDetailsDialog(detailsDialog, true);
 let addInstanceFlow = new AddInstanceFlow(addDialog, spinnerDialog, instanceDetailsDialog);
@@ -37,6 +38,12 @@ reorderButton.addEventListener("click", () => {
     reorderButton.innerText = reordering ? "Finish reordering" : "Reorder";
 });
 
+resetButton.addEventListener("click", e => {
+    storageManager.reset();
+    updateInstanceList();
+    unsavedChanges();
+});
+
 updateInstanceList();
 storageManager.addSaveCallback(updateInstanceList);
 

static/storage_manager.mts

@@ -62,4 +62,8 @@ export default new class StorageManager {
     addSaveCallback(callback: () => void) {
         this.saveCallbacks.push(callback);
     }
+
+    reset() {
+        this.storage = this.default();
+    }
 }();