fix(core): properly handle async errors in addPluginListener (#14464)

* fix(core): properly handle async errors in addPluginListener

The previous implementation used .then() after invoke() without await, which prevented the catch block from handling rejected promises. Now using await to properly catch errors and allow fallback to camelCase registerListener method.

* Change file and generate `bundle.global.js`

---------

Co-authored-by: Tony <[email protected]>

Author: funnydino

.changes/add-plugin-listener-error-handling.md

@@ -0,0 +1,5 @@
+---
+"@tauri-apps/api": patch:bug
+---
+
+Fix `addPluginListener` fallback added in https://github.com/tauri-apps/tauri/pull/14132 didn't work properly

crates/tauri/scripts/bundle.global.js

@@ -186,16 +186,16 @@ async function addPluginListener<T>(
 ): Promise<PluginListener> {
   const handler = new Channel<T>(cb)
   try {
-    return invoke(`plugin:${plugin}|register_listener`, {
+    await invoke(`plugin:${plugin}|register_listener`, {
       event,
       handler
-    }).then(() => new PluginListener(plugin, event, handler.id))
+    })
+    return new PluginListener(plugin, event, handler.id)
   } catch {
     // TODO(v3): remove this fallback
     // note: we must try with camelCase here for backwards compatibility
-    return invoke(`plugin:${plugin}|registerListener`, { event, handler }).then(
-      () => new PluginListener(plugin, event, handler.id)
-    )
+    await invoke(`plugin:${plugin}|registerListener`, { event, handler })
+    return new PluginListener(plugin, event, handler.id)
   }
 }