obfuscate TTS elevenlabs api key (#19262)

src/lib/components/admin/Settings/Audio.svelte

@@ -548,12 +548,7 @@
 				{:else if TTS_ENGINE === 'elevenlabs'}
 					<div>
 						<div class="mt-1 flex gap-2 mb-1">
-							<input
-								class="flex-1 w-full rounded-lg py-2 pl-4 text-sm bg-gray-50 dark:text-gray-300 dark:bg-gray-850 outline-hidden"
-								placeholder={$i18n.t('API Key')}
-								bind:value={TTS_API_KEY}
-								required
-							/>
+							<SensitiveInput placeholder={$i18n.t('API Key')} bind:value={TTS_API_KEY} required />
 						</div>
 					</div>
 				{:else if TTS_ENGINE === 'azure'}