Show approval in browser-action popup instead of a separate window

Use action.openPopup() to show the approval in the toolbar popup,
which is anchored to the browser window and cannot trigger a macOS
Space switch. Falls back to a separate window if openPopup() is
unavailable. A port connection detects when the popup is dismissed
without a response, and the popup URL is reset to the main UI after
every approval resolution.

src/popup/views/approval.js

@@ -8,6 +8,9 @@ let approvalId = null;
 
 function show(id) {
     approvalId = id;
+    // Connect a port so the background detects if the popup closes
+    // without an explicit response (e.g. user clicks away).
+    runtime.connect({ name: "approval:" + id });
     runtime.sendMessage({ type: "AUTISTMASK_GET_APPROVAL", id }, (details) => {
         if (!details) {
             window.close();