Add Dropdown Default Feature

src/app/app.html

@@ -3,20 +3,21 @@
 <div class="container">
   <h1>AEF Component Test</h1>
 
-  <section>
+  <section id="switch-test">
     <h2>Switch Component</h2>
     <switch [(isActive)]="isToggled" (toggle)="handleToggle($event)"></switch>
     <p>Switch is: {{ isToggled() ? 'ON' : 'OFF' }}</p>
   </section>
 
-  <section>
+  <section id="dropdown-test">
     <h2>Dropdown Component</h2>
     <div style="display: flex; flex-direction: column; gap: 40px; align-items: flex-start;">
       <div>
-        <h3>Object Options</h3>
+        <h3>Object Options (with defaultIndex="1")</h3>
         <dropdown
           [options]="dropdownOptions"
           [(value)]="selectedDropdownValue"
+          [defaultIndex]="1"
           (selectionChange)="handleDropdownChange($event)"
           icon="language">
         </dropdown>