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.svelte

@@ -208,6 +208,7 @@
 					<input
 						class=" w-full text-sm pr-4 py-1 rounded-r-xl outline-hidden bg-transparent"
 						bind:value={query}
+						aria-label={$i18n.t('Search')}
 						placeholder={$i18n.t('Search')}
 					/>
 				</div>
@@ -357,6 +358,7 @@
 						<td class="px-3 py-1 min-w-[7rem] w-28">
 							<button
 								class=" translate-y-0.5"
+								aria-label={$i18n.t('Change User Role')}
 								on:click={() => {
 									selectedUser = user;
 									showEditUserModal = !showEditUserModal;
@@ -408,6 +410,7 @@
 									<Tooltip content={$i18n.t('Chats')}>
 										<button
 											class="self-center w-fit text-sm px-2 py-2 hover:bg-black/5 dark:hover:bg-white/5 rounded-xl"
+											aria-label={$i18n.t('Chats')}
 											on:click={async () => {
 												showUserChatsModal = !showUserChatsModal;
 												selectedUser = user;
@@ -421,6 +424,7 @@
 								<Tooltip content={$i18n.t('Edit User')}>
 									<button
 										class="self-center w-fit text-sm px-2 py-2 hover:bg-black/5 dark:hover:bg-white/5 rounded-xl"
+										aria-label={$i18n.t('Edit User')}
 										on:click={async () => {
 											showEditUserModal = !showEditUserModal;
 											selectedUser = user;
@@ -447,6 +451,7 @@
 									<Tooltip content={$i18n.t('Delete User')}>
 										<button
 											class="self-center w-fit text-sm px-2 py-2 hover:bg-black/5 dark:hover:bg-white/5 rounded-xl"
+											aria-label={$i18n.t('Delete User')}
 											on:click={async () => {
 												showDeleteConfirmDialog = true;
 												selectedUser = user;