fix(ext/router): allow popup.html with query params

The router was doing exact URL match for popup.html, but when
opened in a tab with params (?view=add&type=card), it failed.
Changed to startsWith match like setup.html already uses.

Co-Authored-By: Claude <noreply@anthropic.com>

extension/src/service-worker/router/index.ts

@@ -35,7 +35,7 @@ export async function route(
   const setupUrl = chrome.runtime.getURL('setup.html');
   const senderUrl = sender.url ?? '';
 
-  const isPopup   = senderUrl === popupUrl;
+  const isPopup   = senderUrl.startsWith(popupUrl);
   const isSetup   = senderUrl.startsWith(setupUrl);
   const isContent = sender.tab !== undefined
                   && sender.frameId === 0