fix(a11y): enhance accessibility for chat settings components (#21715)

This commit adds aria-labels to the text inputs and textareas that previously lacked them, applies role=switch to inputs, and adds accessible titles to floating quick actions.

src/lib/components/chat/Settings/General.svelte

@@ -269,6 +269,8 @@
 							toggleNotification();
 						}}
 						type="button"
+						role="switch"
+						aria-checked={notificationEnabled}
 					>
 						{#if notificationEnabled === true}
 							<span class="ml-2 self-center">{$i18n.t('On')}</span>
@@ -306,6 +308,7 @@
 							? 'text-gray-800 dark:text-gray-100'
 							: 'text-gray-400 dark:text-gray-500'}"
 						type="button"
+						aria-expanded={showAdvanced}
 						on:click={() => {
 							showAdvanced = !showAdvanced;
 						}}>{showAdvanced ? $i18n.t('Hide') : $i18n.t('Show')}</button