Break out helper functions from the frontend's managers and stores (#3920)

* Move destructor call to each manager/store constructor for safety

* Break out utility functions

frontend/src/managers/hyperlink.ts

@@ -3,6 +3,8 @@ import type { Editor } from "@graphite/editor";
 let editorRef: Editor | undefined = undefined;
 
 export function createHyperlinkManager(editor: Editor) {
+	destroyHyperlinkManager();
+
 	editorRef = editor;
 
 	editor.subscriptions.subscribeFrontendMessage("TriggerVisitLink", async (data) => {
@@ -19,6 +21,5 @@ export function destroyHyperlinkManager() {
 
 // Self-accepting HMR: tear down the old instance and re-create with the new module's code
 import.meta.hot?.accept((newModule) => {
-	destroyHyperlinkManager();
 	if (editorRef) newModule?.createHyperlinkManager(editorRef);
 });