ext(sw): add get_active_tab_url popup handler

extension/src/service-worker/router/popup-only.ts

@@ -146,6 +146,19 @@ export async function handle(
     case 'rate_passphrase':
       return { ok: true, data: state.wasm.rate_passphrase(msg.passphrase) };
 
+    case 'get_active_tab_url': {
+      const tabs = await new Promise<chrome.tabs.Tab[]>((resolve) => {
+        chrome.tabs.query({ active: true, lastFocusedWindow: true }, (t) => resolve(t));
+      });
+      const tab = tabs[0];
+      if (!tab?.url) return { ok: true, data: null };
+      // Filter out chrome:// and extension URLs — autofill doesn't apply.
+      if (/^(chrome|chrome-extension|moz-extension|edge|about|file):/i.test(tab.url)) {
+        return { ok: true, data: null };
+      }
+      return { ok: true, data: { url: tab.url, title: tab.title ?? '' } };
+    }
+
     case 'generate_password': {
       const password = state.wasm.generate_password(JSON.stringify(msg.request));
       return { ok: true, data: { password } };