feat: Refactor Select and Updater for improved readability and functionality

Summary of changes
- Updated `select.mjs` to clarify observer context
- Refactored `updater.mjs` for cleaner change application

In `select.mjs`:
- Added a comment to indicate the observer context is a `ProxyObserver`, improving code readability and making intentions clear.
- This change helps future developers quickly understand the purpose of the code, reducing potential confusion.

In `updater.mjs`:
- Simplified the while loop condition to check `this[pendingDiffsSymbol].length` directly.
- Refactored the change application logic into a private method `#applyChange`, consolidating the steps of removing, inserting, updating content, and attributes into a single place.
- This makes the code cleaner and more maintainable, reducing duplication and enhancing readability.

source/components/form/select.mjs

@@ -608,9 +608,9 @@ class Select extends CustomControl {
 			let lastValue = self.value;
 			self[internalSymbol].attachObserver(
 				new Observer(function () {
+					// this is here not the Control, but the ProxyObserver
 					if (isObject(this) && this instanceof ProxyObserver) {
 						const n = this.getSubject()?.options?.value;
-
 						if (lastValue !== n && n !== undefined) {
 							lastValue = n;
 							setSelection
@@ -806,6 +806,7 @@ class Select extends CustomControl {
  * @returns {any}
  */
 function importOptionsIntern(data) {
+
 	const self = this;
 	const mappingOptions = this.getOption("mapping", {});
 	const selector = mappingOptions?.["selector"];

source/dom/updater.mjs

@@ -154,26 +154,25 @@ class Updater extends Base {
     }
     this[processingSymbol] = true;
 
-    while (this[pendingDiffsSymbol].length > 0) {
+    while (this[pendingDiffsSymbol].length) {
       const diffResult = this[pendingDiffsSymbol].shift();
-      for (const [, change] of Object.entries(diffResult)) {
-        await new Promise((resolve, reject) => {
-            try {
-              removeElement.call(this, change);
-              insertElement.call(this, change);
-              updateContent.call(this, change);
-              updateAttributes.call(this, change);
-              resolve();
-            } catch (err) {
-              reject(err);
-            }
-        });
+      for (const change of Object.values(diffResult)) {
+        await this.#applyChange(change);
       }
     }
 
     this[processingSymbol] = false;
   }
 
+  /** @private **/
+  async #applyChange(change) {
+    removeElement.call(this, change);
+    insertElement.call(this, change);
+    updateContent.call(this, change);
+    await Promise.resolve();
+    updateAttributes.call(this, change);
+  }
+
   /**
    * Defaults: 'keyup', 'click', 'change', 'drop', 'touchend'
    *