feat: obscure webhook ID with password field masking

Co-authored-by: JOHLC <63735432+JOHLC@users.noreply.github.com>

Author: Copilot

package/options.html

@@ -23,7 +23,7 @@ <h2>Send to Home Assistant</h2>
   <label for="sslToggle"><input type="checkbox" id="sslToggle" checked> Use SSL (https)</label>
   <div class="webhook-row">
   <label for="webhookId"><a href="https://www.home-assistant.io/docs/automation/trigger/#webhook-trigger" target="_blank" rel="noopener noreferrer" class="link-blue">Webhook ID</a></label> 
-    <input type="text" id="webhookId" placeholder="xxxxxx-xxxxxxxxxxxx">
+    <input type="password" id="webhookId" placeholder="xxxxxx-xxxxxxxxxxxx">
   </div>
   <label for="userName">User <span class="label-note">(optional)</span></label>
   <input type="text" id="userName" placeholder="Your name (optional)" maxlength="32">