fix(a11y): enhance accessibility for admin user components (#21717)

This commit adds aria-labels to the search inputs, select fields, action buttons, and close buttons on modals across the admin users layout and the site changelog modal for improved screen reader support.

src/lib/components/admin/Users/UserList/AddUserModal.svelte

@@ -133,6 +133,7 @@
 			<div class=" text-lg font-medium self-center">{$i18n.t('Add User')}</div>
 			<button
 				class="self-center"
+				aria-label={$i18n.t('Close')}
 				on:click={() => {
 					show = false;
 				}}
@@ -182,6 +183,7 @@
 									<select
 										class="w-full capitalize rounded-lg text-sm bg-transparent dark:disabled:text-gray-500 outline-hidden"
 										bind:value={_user.role}
+										aria-label={$i18n.t('Role')}
 										placeholder={$i18n.t('Enter Your Role')}
 										required
 									>
@@ -200,6 +202,7 @@
 										class="w-full text-sm bg-transparent disabled:text-gray-500 dark:disabled:text-gray-500 outline-hidden"
 										type="text"
 										bind:value={_user.name}
+										aria-label={$i18n.t('Name')}
 										placeholder={$i18n.t('Enter Your Full Name')}
 										autocomplete="off"
 										required
@@ -217,6 +220,7 @@
 										class="w-full text-sm bg-transparent disabled:text-gray-500 dark:disabled:text-gray-500 outline-hidden"
 										type="email"
 										bind:value={_user.email}
+										aria-label={$i18n.t('Email')}
 										placeholder={$i18n.t('Enter Your Email')}
 										required
 									/>
@@ -231,6 +235,7 @@
 										class="w-full text-sm bg-transparent disabled:text-gray-500 dark:disabled:text-gray-500 outline-hidden"
 										type="password"
 										bind:value={_user.password}
+										aria-label={$i18n.t('Password')}
 										placeholder={$i18n.t('Enter Your Password')}
 										autocomplete="off"
 										required