Refactor JS code for consistent formatting and style

Standardized spacing and object literal formatting across multiple JS files for improved readability and consistency. No functional changes were made. Minor Python formatting adjustment for line length in canvas_node.py.

js/db.js

@@ -29,7 +29,7 @@ function openDB() {
             console.log("Upgrading IndexedDB...");
             const db = event.target.result;
             if (!db.objectStoreNames.contains(STORE_NAME)) {
-                db.createObjectStore(STORE_NAME, { keyPath: 'id' });
+                db.createObjectStore(STORE_NAME, {keyPath: 'id'});
                 console.log("Object store created:", STORE_NAME);
             }
         };
@@ -62,7 +62,7 @@ export async function setCanvasState(id, state) {
     return new Promise((resolve, reject) => {
         const transaction = db.transaction([STORE_NAME], 'readwrite');
         const store = transaction.objectStore(STORE_NAME);
-        const request = store.put({ id, state });
+        const request = store.put({id, state});
 
         request.onerror = (event) => {
             console.error("DB: Error setting canvas state:", event.target.error);