fix: permissions

Author: Junyi-99

webapp/_webapp/src/background.ts

@@ -134,4 +134,4 @@ browserAPI.runtime?.onMessage?.addListener(
   },
 );
 
-void registerContentScriptsIfPermitted();
+registerContentScriptsIfPermitted();

webapp/_webapp/src/libs/permissions.ts

@@ -1,7 +1,7 @@
 // can not running in content_script. registerContentScripts can only be called in service_worker.
 export async function registerContentScripts(origins?: string[]) {
     try {
-        const resolvedOrigins = origins ?? (await chrome.permissions.getAll()).origins || [];
+        const resolvedOrigins = origins ?? (await chrome.permissions.getAll()).origins ?? [];
         if (resolvedOrigins.length === 0) {
             console.log("[PaperDebugger] No origins found, skipping content script registration");
             return;